spotted... now what?

My bf and I didn't have sex for 2 weeks and finally we ended up having sex on Wednesday August 10th. It was not rough sex!  Then the next day... Thursday August 11th we had sex again. Both times unprotected, but he doesn't finish inside of me & he pulls out in time. The next day.. Friday August 12th I got in the shower that night and I looked down and there was a little bit of blood on the shower floor and it shocked me so I looked between my legs and sure enough blood was dripping down my legs... This wasn't normal blood. It wasn't bright red or dark AT ALL. It was light/faint. Pinkish-reddish colored and it happened, I washed it off, and it didn't happen anymore. I mean NO MORE. It only did it that once and stopped completely. Then the next day after that Friday August 13th.. I had brown sticky/creamy dishcharge. And I never have brown discharge. And the day after that I had white creamy discharge. I usually have my periods at the beginning of the month. Or it will be at the very end of that month like the 30th or 31st and it will roll over into the beginning of the next month, so I had my period in August already. It was at the beginning of the month like normal. I'm just trying to figure out why I randomly spotted like that and had brown discharge the next day. No other symptoms besides I'm a little gassy and my face is breaking out oddly like it never ever does. Anyone have any idea why I could've spotted like that? Orrrr anything.