My cycle, since I miscarried in June, has been exactly 25 days,,,except last month. It came three days late making it a regular 28 day cycle, I am trying to conceive so...at the time was hoping that it meant I was pregnant. So now I am confused as to what day I would be ovulating and such. Anyways, I had unprotected sex twice on day 9 of my cycle, I woke up on day 19 of my cycle, and when i wiped I had just a very tiny bit (maybe a few drops) of red blood when I wiped. I checked myself to see if I had maybe gotten a scratch or cut down there that it may have come from but I did not find any. I wiped clear the rest of the day. Could this have been implantation bleeding? I am not sure if it could really be that light but I have never had any kind of spotting before a period in my life and my period shouldn't be due for maybe another week.
Taking the morning after pill can make your cycle go out of wack sometimes. It is probably just because of taking it that your cycle is seeming weird. And also, with the length of your cycle, it is unlikely that sex so soon after your period would have resulted in pregnancy anyways.