My boyfriend and I have had regular sex every day during my fertile window and has came in me. And has continued to do have sex and cum in me even after my fertile window. And now I'm 12 days late for my period. We had sex recently and I bled, and then that was it. My boobs have gotten a little bigger, and my nipples are now always hard swollen and tender, my back hurts all the time and hurts more when I stand for too long ( its never ever happened before, I don't have any back problems), I'm constantly tired and sleep for hours end, I get a weird stretching cramp feeling in my stomach, and I've spewed a couple of times already . I've already done a pregnancy test and it came negative.

So to the end of this rant, what do you think is up with my body ??