Let me know please 🧐

Okay so I ended my period a couple weeks ago and me and my boyfriend have been having sex every night since I ended and recently I’ve been experiencing my boobs aching my nipples to be more specific and I’ve been going through some mood swings and I’ve had some slight cramps I also woke up this morning with a little bleeding but i haven’t bled since. I’m just curious on what could be causing all of this