I have had sex once, it was on august 31 2008, it was on the last day of my period. Which had lasted two weeks because it came a week early. I am birth control, tri-sprintec. I also take azithromax. He was inside for a very short amount of time probably in and out (sorry to be so descriptive) three times and we decided it was best to put on a condom. We did and after he finished he removed it away from me. We didn't "go again" or anything. This was the only time. Then my period came again on september 18th or 19th a little early but about right. Now it should have started last night but didn't I have no signs of it starting either. Also I spoke with my doctor before and asked about the early periods and she said it was probably due to missing pills/taking them late or to me recently taking up yoga. After it had came early three months in a row this month i decide to drop the yoga for a bit to see if that is what was causing it, since it didn't come early and that is the only thing I have changed I am thinking that is possible too, but it hasn't came yet and even though it has only been about 14 hours from when I was supposed to start I am a little concerned because A) I am hardly ever late and B) I was early for three months so why all of sudden late.