So since I started taking my depo shot I haven't had a period. And maybe back in January or February I forgot to get it refilled and didn't take it until like 2 weeks ago and still haven't gotten my period. And like 2-3 weeks ago I had sex and the condom came off in me before ejaculation which we then got it out and got a new condom. Still no period and recently I've been nauseous and my stomach has been kinda hard. could I be pregnant or is my body just being weird?