Help.

Elizabeth • Wife since 09/10/17. 👰🏽🤵🏽💍TTC #1 since 09/20/17. 🤱🏽PCOS and Hypothyroidism. Fur mom to four babies! 🐶🐶🐱🐱🐾
So, I haven't had my period this month but I did have really light brown spotting the 4th and the 5th. 
I'm also on the pill, so I know periods can be a little wacky. 
Well, Last night, my boyfriend and I had sex, which kind of hurt a little, like he was hitting something inside me, if that makes any sense and when we were done, I saw that I had bled on him so I went to the bathroom, guessing I had started. I peed then wiped and there was just REALLY light pink on the toilet paper so I decided to put a pad on to be safe and as I was sitting there, I got really dizzy and felt like I was going to puke but this morning, I went to the bathroom and there was nothing on my pad and nothing on the toilet paper after I had wiped. 
What is this?