Spotting

So I’m kinda getting worried. It seems like every time my husband and I have sex, (which isn’t often, maybe 1-2 times a week as we both work a lot and are exhausted). But anyway, I spot not long after and then I start to feel very very sore with some cramping. Sometimes it’s brown like old blood, other times it’s bright pink or pale reddish color. And sore Like 5 sessions of back to back sex, sore. It’s uncomfortable to walk even. It’s not like we’re having raging rough sex, either. My husband is too worried to hurt the baby, so it’s pretty gentle and calm. I’m 14 weeks along with our rainbow baby. I’m going to call my ob tomorrow but I guess I just need some peace of mind. Has this happened to anyone else and is it normal or should I be concerned? Tia.