brown discharge after sex?! 😨

Nicole
I am 12.5 weeks. Sex has been painful ever since I got pregnant- I am super tight down there and it's too much friction and sensitivity for me to handle. 
We have only had sex 3 times since I got pregnant because of this. Last night hubby was begging for it even though I was dreading it! Sure enough, it was so painful- basically felt like losing my virginity. 
This morning I woke up with what feels like period cramping and brown discharge, I'm so worried! It's the weekend so I don't know what to do or if this is normal...