TTC help?

So just around april i had my first DEPO shot and just this month on the 15th i was due to go and get another shot but I refused and told the women that I'm trying to concieve. I got my period last week friday and I'm still "on my period" or "spotting" i just dont know if this is normal after coming off this birth control or if i should go and get checked out because my calendar on GLO says I'm fertile tomorrow but I'm sort of still having some bleeding...my period usually lasts five days never this long.