Unusual cramps!

Sam
So I made a post the other day about this but it doesn't seem to be going away! I'm in my fertile week and I've been getting really strong period like cramps... I never get these while in my fertile week! I will get the odd twinge but these are really painful! I'm a bit worried! We have bd over the past few days but not sure what's going on with these painful cramps :( help please! Xx