What’s going on with my body????

Sa

I am currently 13 days late.. the hubs and I thought we had a vvvvvvfl on the HPT but then the next day we had a BFN so we went to the dr and they drew blood and of course they said it was negative.. and i mean yea i am upset about it I really want a baby but now I’m more concerned with why I’m not having a cycle.. i never miss a month.. I don’t come on at the same time every month but i still have a cycle every month.. what could be going on with me?? Could the test be wrong and i am pregnant?? Has this happened to anybody?? Please share your stories with me maybe you can help me come up with some answers