I have a problem with my hair shedding alot for 2 or 3 years now. I went to the dermatologist and the doctor said my hair looks fine and he doesn t see any bald spots. I take Biotin everyday. However, when I take a shower, a lot of hair comes out. Last month my period was late and this month I haven t had it yet. 2 weeks ago I had sex on Thursday and the condom was slipped off. I was worried that I am pregnant , so I went online to search for pregnancy symptom and came across a website saying taking Plan B One step pill will prevent pregnancy if you take it within 72 hours. I had sex on Thursday and took the pill on the late evening Saturday. On that same Saturday, the morning I had my hair dyed. Since then, I notice my hair has been shedding alot. I counted the hair (maybe more than 100 hairs/aday -- taking a shower and ran my hand through my hair). I notice everytime I ran my hand through my hair, 3 or 4 strands came out. Imagined if I run my hand through my hair 10 times, totaled 40 hairs would come out. I am scared now. My question is: do you think Plan B One step can cause hair loss? How long does the pill wear off?