a few weeks ago I was with my fwb and it was great sex...but when we were done there was pieces of my skin on the condom... Like chunks. I tried to Google this and nothing came up so, very very shamefully, I asked my mom and she said it might be since I recently had my iud taken out a month ago....and said it was probably the start of my period. my period did start,and so I thought so but I'm still not sure because the skin didn't look like something that would come out of my uterus, I've seen videos of th inside of the vagina and it loo exactly like the walls that fell out.