my last period started on aug 17th, I had unprotected sex (twice) on 25th of August.....thought nothing of it until Monday 2nd Sept when I had sore breasts, which were worse the next day when someone hugged me I had to back off. I have been noting a few other symptoms too such as heartburn, short headaches, feeling emotional etc. I've taken 2 tests both negative but still feel something isn't right??