After continued unprotected intercourse with my husband, I took Plan B, but continued to have unprotected sex with another man. Could I be pregnant? #328/10

My husband and I are having unprotected sex all of the time.  I had a regular cycle. Thursday, March 4th, I had unprotected sex with another male around 1:00 PM.  On Saturday I took Plan B and I continued having unprotected sex with my husband.  On March 19th my period began, but I feel like crap.  Could I be pregnant and could the other man be the father or is my husband?


You had unprotected sex, but apparently have had a period after all this.  A sensitive urine pregnancy test should be accurate now.  If negative and you want confirmation that you are not pregnant, repeat the test in 10 days.

Plan B is definitely not effective enough as an ongoing contraceptive.

On this website I never comment on who might be the father if a person has had sex with more than 1 man in the course of one cycle.

If a woman has just one act of unprotected sex, then within 5 days she could use Plan B and for the next 7 days she could have a ParaGard IUD (a copper IUD) inserted.


So, the next time you have unprotected sex, in a quiet moment ask yourself how disruptive an unwanted pregnancy would be to your life.


And then consider the following 2 cases and the approach of the clinician below who routinely urges all women thinking about emergency contraceptive pills also to consider an emergency contraceptive IUD:


Your risk of pregnancy after using emergency contraceptive pills is about 1 in 100.  If you wanted to lower this risk, you could go get a copper T IUD inserted and this would lower your risk of pregnancy to about 1 in 1,000 AND THEN YOU COULD CONTINUE TO USE THE IUD FOR CONTRACEPTION FOR AT LEAST 10 YEARS.


Could you possibly be pregnant from that one act of intercourse with the man who was NOT your husband? It is unlikely.  About 1% as I noted above, as you have been perfect in your response to this emergency in terms of emergency contraceptive pills.  But you could also become pregnant from the times you had sex in the same cycle with your husband.


Here is something I wrote up to discuss the 2 approaches to emergency contraception. Please read this carefully thinking of what an unintended pregnancy would mean to you right now in your life:


When a woman has had intercourse and she is concerned that there is a chance of pregnancy she can use one of 2 approaches to emergency contraception. She can take emergency contraceptive pills.  She has about 5 days from her most recent unprotected intercourse to do this. Then her risk of pregnancy from one unprotected act of intercourse falls to about 1 in 100. If she uses Plan B she should take them as soon as possible and take both Plan B tabs at once.


A more effective approach would be to have a copper IUD inserted within 7 days of unprotected sex.  If she does this, the chance of pregnancy is just 1 in 1,000 and she will then have in her uterus an extremely effective contraceptive and a fully reversible contraceptive that she can use for 10 or more years.


Below are 2 examples of emergency copper T 380 A insertions (ParaGard insertions) for women who have had recent unprotected intercourse.  They are the 80th and 81st insertions by the same nurse practitioner in Charlotte, North Carolina

Case #80: A 22 year-old, who has been pregnant once, having had an abortion (G-1 P-0 A-1). She had the termination on 2-1-08. The clinic did not start her on a birth control method after the procedure because her blood pressure was “too high”. She had used Depo-Provera injections in the past but gained too much weight. Her BMI is 34 (very overweight!) Her BP yesterday was 118/84. She was contemplating using the NuvaRing. She had unprotected sex 3/15/08 and did not know about emergency contraception. She also had had unprotected sex prior to 3/15 with no bleeding after the 2-3 wks of bleeding from the procedure. Her pregnancy test was negative. She informed us that she “never wanted to be pregnant”. On exam, she had an apical pulse of 64/m and a very irregular heart beat without murmur or extra sounds. She had no prior history of heart problems. When I questioned her about activity she admitted that sometimes she got dizzy if she stood for awhile and if she climbed steps. No history of syncope on exertion. I reviewed the range of birth control options, Emergency Contraception with Plan B and emergency contraception using a ParaGard IUD. She wanted Emergency Contraception and an ongoing birth control method that would protect her after leaving the clinic. She chose ParaGard. I referred her to an ambulatory care clinic where they will follow up on the arrhythmia. Happy Camper # 80!

Case #81: 23 yr old presented to our family planning clinic for initial exam on March 20, 2008. She had been pregnant 4 times, having had 3 abortions and she has on living child (G-4 A-3 L-1). Her last normal menstrual period was on March 10, 2008. She was not using a contraceptive method and was considering Depo-Provera injections or an IUD. Her last unprotected sex was March 18 (2 days previously). She did not know about Emergency Contraception. After reviewing her options for both Emergency Contraception and ongoing birth control she chose the ParaGard IUD. Happy Camper # 81!

Good luck to you and be sure to let me know what happens in the next 10 days with regard to your pregnancy test(s)


 Key Words: unprotected sex, regular cycle, Plan B emergency contraceptive pills, period, pregnant, sensitive urine pregnancy test, accurate, negative, repeat test, ParaGard IUD


Helpful Books:       

Contraceptive Technology 20th Edition

Managing Contraception 2014-20159

Choices 2013

Posted 4-3-2010, Updated 4-7-2010, Updated 7-9-2011, Updated 8-26-2014


Posted on

August 26, 2014