Worried 🤔🤔

So my boyfriend is in the military and he was recently on leave. Obviously we made up for lost time and got intimate. We aren't the type to use condoms because we are both clean and have been together long enough to be comfortable. I'm on birth control, but I'm not getting my period. The morning after we had sex for the first time, I bled. The whole day I bled, as if I was on my period. Then it just stopped that night. All was fine but now, a week/10 days later, I've been so bloated and fatigue. My boyfriend is away again and doesn't have his phone, so I can't talk to him about this unless it's through a letter that takes a week to get there. I'd rather see what y'all have to say before I mention this. Help!!!!