Missed period on birth control

[Speechie22]

I have been taking birth control for the last 5 years and recently switched to a new pill for the last two months. I had a throat infection and was given a z pack to take for five days, I took this about the second week into my pack.  Well during this month of be I took two pills very late due to a busy schedule and forgot, my boyfriend and I had unprotected sex during this month as well.  Well a week after I took the z pack I had spotting for about a week that was moderately heavy. Now, two weeks later I have finished my placebo pills and have not had my period, not even spotting or cramps.  I took a pregnancy test today at home and it was negative.  Should  I stop taking the bc and see if my period happens?  Any advice would be appreciated.    . . . . . Also should I tell my boyfriend about all of this or wait until my period happens or I take another test?  

[Cathleen Zoretic, RN]

You should stop your birth control pills if you suspect you are pregnant. However, if you are going to be sexually active, you should use another form of birth control such as condoms, until the pregnancy is confirmed or ruled out.

[Speechie22]

Should I continue to take my birth control, I would be starting a new pack

[Cathleen Zoretic, RN]

Thanks for using the forum..

As I think you know, antibiotics can decrease the effectiveness of birth control pills. It is possible that your cycle is off due to the change in your birth control pill and the doses that you took late. However, all things considered, there is a chance that you could be pregnant.

A home pregnancy test is most accurate 1 week after your missed period. The levels of the hormone hCG  have to be high enough to be detected in your urine. It is possible to have a negative pregnancy test and be pregnant.  If you do not get your period, test again. Use the first urine in the morning, it often has the highest concentration of pregnancy hormone.

Good luck. I hope that this helps.

Cathy