Help? depo question!

I've Had Three Regular Periods After My Last  Depo-Provera Vaccination (Every 3 months & periods stopped along with the shot) I got my time of the month again which was only three weeks after  my last scheduled dosage which I missed and haven't gotten Scheduled for October 28th and Every month since than till now I gotten my period But I Have Had Sex With My SO on My fertile Days And My Period Is Late By Seven Days Could I Possibly Be pregnant? The reason I ask Is Because many woman claim to not have been able to conceive for months even years after depo (until they're period cameback)