Still pregnant with very odd 'period' bleeding


Ok, to start this, I have always had rather low HCG hormone, I didnt know I was pregnant with my others till I was 2 months or more. I have not taken a test since I bled but the 'period' in question was the weirdest one I've ever had. No clots, not a lot of bleeding and I should explain that I have horrid periods, clots the size of large oranges and bleeding so bad I go through about 40 pads a period. I am not sure, maybe I'm going crazy but I'm having pressure in my pelvic area, I feel 'heavy' and 'full', REALLY tender breasts, frequent it possible to be pregnant?