pregnant on depo provera?

My boyfriend and I have been having sex unprotected since late feburary like the 27th and 28th. I got the Depo shot on March 13th because my “mom” made me. They did a urine test and it came out negative so they gave me the shot, well him and I had sex two days before I got the shot, and he came in me, a lot…so I don’t know if that test was accurate. So after a week or two of wondering I took another test and it was negative. MY boyfriend and I are continuing to have unprotected sex because we want a baby and we’ve had sex at least more than 5 times unprotected with him cumming in me since the shot. But I havent taken a test since March 30th. Im too nervous too…I thought I was pregnant but than I got this really weird “period”, no cramping but it was brown discharge for 10days than a small amount of blood for 3days. Im very confused…we really want a baby and I dont want to be judged for it I just need some answers. I kind of really dislike my mom for making me get that shot after reading all the things I have. So I guess my question is, is there a possibility I can be pregnant and the tests are just wrong because im taking it too soon? has anyone else gotten pregnant on Depo? How did your baby turn out? Any info will help. And can you still bleed while pregnant? thank you.