im not saying you are pregnant but it's a very slim chance that you are but if your worried i would take a test i mean it couldn't hurt anything!!
I used plan b and had two pds in the same mth after I took it I am now 36 weeks pregant.. Plan b doesnt work if your already pregant im proof of that lol. So if I was you I would take a test
Well the plan b isn't always 100% effective that being said the plan b pill can also effect your cycle. Try testing with the first morning urine but with you having had your period before id say its probably from the pill
I would guess not if you took plan b and had a period. Was it a normal period though or lighter than usual? I would say do a pregnancy test if you still dont get your period in a few days. You could just be off this month. Good luck!