I need HELP PLEASE!

I took a test a day before my period was suppose to be due, it was a very faint positive. I purposely waited today it would of been my 6th day late... But I started to heavy bleed last night, I decided to take a test anyways to put my mind to ease.. But again to me it looks like a positive, I'm so worry that something bad is happening!! I have NO cramping at all! But the blood is bright-dark red with a couple blood cloths.. Looks like a period. I had unprotected sex 4 times while I was ovulating, I thought for sure I was pregnant I've been getting extreme nauseous and headaches that past few days! Please help me tell me what your opinion is.. This would be my first time..