I was on the pill for about 4 years continuous. I've been off it for a month because I'm switching to the depo shot, which I haven't gotten yet. Well long story short I took plan B about 4 days ago and this morning I had a large amount of clear, odorless mucous streaked with small amounts of fresh blood in my underwear. I've never had anything like that before. Should I be worried? Is it normal? Someone told me that it's normal for fertile women to have this happen a week before their period, but I've never heard this before and I've certainly never experienced this before, but I should have my period in about a week. I have had very tender breasts since taking Plan B but I was told to expect that. Any advice?