I just started on a lower does birth control pill this past month. My fiance and I had sex 7 days after I starting the lower dose birth control. We had sex for 4 days in a row. I started taking antibiotics on day 11 of taking my new birth control for a sinus infection. In the past I never had spotting or bleeding while on my active pills until today, it was a pinkish discharge not red, not like my period. I heard implantation bleeding can be like this. I have also had cramping since the bleeding started as well, but different than menstrual cramping. However I was wondering if the new lower dose birth control with the antibiotics could have made it possible for me to get pregnant. I am supposed to start my period in 4-5 days from now and will take a pregnancy test if I do not get it by then. I've never thought I was even pregnant before so I was just wanting to get some advise to see if anyone thinks that could be a possibility. Thanks!