My boyfriend lives 15 hours away for work so when he gets a chance to come home, it’s our only opportunity to have sex. I was ending my birth control pack this week. We had unprotected sex twice while I was still talking pills, and then twice when on my sugar pills. My period normally comes two mornings after I start my sugar pills (I take them at night). I had sex the 2nd night of sugar pills and the following morning. That morning after sex, I got my period but it was a super light flow and very pink and watery. Today (the next day) it is a lot of brown, but still very light. Normally my period is brown and normal heavy the first day transferring into red normal  heavy the next. Would the sex be effecting this? Could this be early implantation bleeding bc of the time of my period and when this happened? I also skipped sugar pills two packs back and it effected my last period. Could it be effecting this one as well? My periods since I started birth control (5 months ago) have been pretty consistent, so what is causing this sudden change? Thank you!!