Is it the birth control or can I be pregnant? Please help!?

I've been pretty tired even when I get enough sleep and I pee more than usual it seems. Ive been cramping and maybe a little more hungry and I noticed some light brownish discharge yesterday but now I don't have it. Ive been on the depo birth control shot for a month and we don't use condoms but he... show more I've been pretty tired even when I get enough sleep and I pee more than usual it seems. Ive been cramping and maybe a little more hungry and I noticed some light brownish discharge yesterday but now I don't have it. Ive been on the depo birth control shot for a month and we don't use condoms but he usually pulls out. Except one time about two weeks ago. I've also not had my period this month and am about 16 days late. Is this normal or could I be pregnant? I heard the shot can give you pregnancy signs even if you're not. So is it possible that I am even though I'm on birth control? It feels like I'm on my period but I'm not. Any advice would help. Thanks in advance!
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