My cycles are a little irregular, usually from 30-34 days lasting 6-7 days. My boyfriend and I had sex on CD4, so while I was on my my period which made my period into spotting and then stopped. I started reading that pre-CM can get you pregnant and in some cases even if you're on your period so I took Plan B the next day (24 hours) just to be safe. After I took plan B i started spotting again, lightly bleeding. I should have finished my period on CD6 but the spotting went on to CD10, which I thought was caused by the pill. Now I'm on CD38 which would make me 5 days late. So I believe CD7-CD10 was the withdrawal bleeding. My question is, should I count the plan B withdrawal bleeding as CD1? Is it normal for my period to be late even though I took it way before ovulation? I've heard if you take plan b before ovulation you should get your period earlier.