I Was On Depo Provera Last July Until Around The

I was on depo provera last July until around the same time this year. I was supposed to take my next shot September but didn't. My period hasn't come back yet. And I think I lost a little weight.

I had unprotected sex about a week and a half ago and took plan b the next day. It's been a week and yesterday and today I noticed slight bleeding very light. I also feel funny like as if I have my period again. I'm not really sure what's going on and if this okay.

Thank you