Dumb plan b

So i have been on the pill for about 12 years my husband and are still not ready for a baby about 6 days before I was to start my period i totally forgot to take my pill two days in a row! I don't know what happened and of course my husband and i had sex so u went and got the plan b pill. Now i haven't started my period yet there are 3 more days according to the pill that i should be on my period and i have had horrible cramps! I really hope its just the plan b messing with my period I'm not ready for a child yet. Any thoughts?