Why am I doing this?

Well I belive I started priod for the first time in 9 months because I was on the Depo shot after my son was born and I never have had a period. Well I started the 22nd of Jan and it ended on the 26th so I thought i was not dew for a while. Well I spok to soon beacuse I started bleeding agin on the 3rd of Feb. I already talked to my Docter and she said its really nothing, but I really dont know. Do you think this is my period still or am I possabley pregnent.