Help Is this normal?!!!!!!!!!!!!?

I've been paranoid about being pregnant from i was wearing underwear and my bf didnt on sept. 25th since then I've had an October trios on the 11th started out light brown then pink then red. I also took 6 pregnancy test the month of October all negative. Then my gyno gave me a blood test on November 3rd and it was negative............she also put me on birth control. I just want to know that when I lay flat on my back and push under my belly on I feels a big layer of my sqishy fat and sun I push real hard I feel something hard and flat is that normal???