2nd period question!!

Okay so I'm going to try to make this story short 3 weeks after having my baby me and my husband had sex and he came in me. I took the morning after pill 4days after. A week later had my 1st period. I've been waiting on my 2nd one because I was worried I might be pregnant again. Well yesterday I started spotting and at first I was so happy thinking in a few hours I'll have my natural flow and it's my period I'm not pregnant. Well this morning I got up and checked and it's like I'm not really bleeding more of light spotting. I took a test a few days before my period and it said negative. But my question is. Is this normal? Or could i still be pregnant?