So last week on a Sunday I had sex and forgot to take the pill so I took A plan b pill Monday the 8th of Feb so  since I kept forgetting a lot prior to that incident I decided to switch to depo Povera so later that week 10th /11th I went to the doctor for prescription on the depo  and she said wait 2 weeks stay absenent to stop taking the birth control (I was between refills) then we take a pregnancy test if it comes back negative we put you on the depo so then Sunday came 14th of Feb and my period came I assuming because of the plan b and the they times I took plan b I always still got my period around the same time I would normally but since I stopped the pill too anyways it lasted 3 days(been taking the pill about 8 months now and my period went from 5 days to 3 over that time and it has stayed at three and Mabey one time 5 after a while) Sun Mon Tues and on Wednesday I got my depo shot because In suppose to take it within the first 5 days of a period but my period was 3 days and I had sex 24hrs later bc it says it starts working 24hrs later  if it's taken during the first 5 days from the beginning of a period I just wanted insight if this is correct or not or what should I do or what's going on thank you ladies!