So I've been experiencing a lot of unusual things. First my period was late. I missed 1 month on my period. I figured I was pregnant. Took some HPT and they all came up negative. I had really bad pelvic and lower back pain. I've felt nauseous and just plain sick. I've had two children before this. My youngest is 4. Than yesterday my husband and I had sex. A little later I started spotting and got a little concerned. The spotting was almost like pink discharge. Now today I'm bleed heavily and clotting. This is heavier but not like my period. Please help me.