could it be?

I receive my first depo on a Monday when I wasn't on my menstrual cycle, had sex the next day and I used a comdom because they said use protection for the first seven days,  but it popped n he ejaculated an me once or twice took a at home pregnancy test it was negative but no signs of a menstrual but having pregnancy symptoms could I b pregnant help ladies first time doing birth control its been almost a month