Bleeding after sex is normal. Always talk to your doctor if you're concerned, but it is most likely absolutely nothing to worry about.
I had the same when I was 9 weeks. No cramps but what to me seemed like a lot of blood. It didn't last only for about an hour after. I'm 38weeks now and being induced tomorrow. You should be just fine but head to hospital if bleeding continues or u get bad cramping. Good luck
If your not cramping and blood isn't bright red you should be ok