Pain After Sex!

So I've been TTC for 6 months and I am currently 8 days late for my period. Last month I thought I was pregnant cause I was late 13 days. I'm always regular, 30 days. This month us the only month where I feel very weird and me and my man had sex 2 days ago and I had a little pain afterward, and then today the same thing. I'm not sure what's going on. I feel like my pelvic area is sore. I'm not having bleeding at all so I'm not sure what's going on. I haven't tested either cause I just "don't feel pregnant".... what can this be?!