Should I be concerned (on depo)?

So I got my first depo shot on February 21st, but I also got my first hsv outbreak and assumed that my spotting or “period” was caused by that. Since I had an outbreak and was diagnosed, my boyfriend and I have used condoms in order to prevent any spreading. Since the 21st, I have not had a period or any speck of blood. My period/spotting in February lasted about 5 days, but it was only brown and never full blood if that makes sense. My point is, is it possible to be pregnant? I’m more so worried that I was already pregnant in February and didn’t know it, or maybe it’s just the hormones from the shot who knows. Anytime my period is late I kinda freak out, even though the doctor told me it can stop your period. It just seems crazy that it would within the first cycle, but I’m not complaining if that’s the case.

Thanks for your input!

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