I just got my period on thursday and on friday it started to be REALLY heavy with very large blood clots. It's been heavy like that for three days and it get's lighter throughout the day, but begins to be heavy the next day after i wake up. There's barely any blood on the pad when I wake up, but once I put a tampon in, it starts to leak through in like an hour. My period doesn't always come at the same time every month, but it is never this heavy. I took a different brand of plan b that I got at the pharmacy about 48 hours after having sex in december and got a regular period 2 weeks later and a month after that. And now, I am currently on this one a week after the one I had at the end january. Why is this period so different? Is it a miscarriage or just irregular from plan b? I did not take a pregnancy test because I didn't think I was pregnant. My mom is calling the doctor tomorrow. Please help