I took Plan B the year back my spell and get it surrounded by between doses of the pill, but not anymore?

I took Plan B the day previously my period and surrounded by between the 12 hour period between the pills, I have gotten my period, but I continued to nick the second pill hours later. Now I don't own my period, is this because of Plan B delay it? read the instructions. I took it and remembered having my interval as normal. You could also appointment a pharmacist for information.