Bleeding after sex

So I'm 29w9d and I haven't been having sex with my bf as much because I was feeling really sore down there to the point where I just didn't enjoy sex at all. So today I mentioned to him that it actually feels normal down there so we start to go at it. My belly isn't very big and he was on top and things were feeling good, like normal sex again, till my bf pulls out and freaks because I'm bleeding. I haven't spotted or bled this whole pregnancy so I'm really scared and run to the bathroom to check. We were about to go to the ER then I read how it can be normal. I have no cramps and the blood is decreasing and pinkish. This is my first pregnancy, so we are a little freaked. I'm just keeping an eye on the amount (which is now very little) and will definitely call my dr to let her know. Just sad cos I'm finally feeling good about sex again and this shit happens 😞😒