I took plan b the morning after I got my period after having unprotected sex. My periods are normally 7 days long and now I'm on my 10th. The flow isn't very very heavy at all and I'm not using a lot of Tampons, I just want to make sure it's normal. I've never had a period this long that I can remember. I'm wondering if this is because I took plan b ? Should I go see a doctor ?