I Was On Depo Provera For Ten Years. My Last

I was on depo provera for ten years. My last shot was in the beginning of February this year and I have not started a period yet. My husband and I had intercourse about a week ago. Two days ago I started having some cramping. Yesterday my husband and I had intercourse again. Later that day I went pee and wiped and there was a little bit of blood. Again today only when I wipe there is light blood. Is this just my period starting and/or is it possible that I could be pregnant?