Periods after csection?

I had my daughter via csection 11.27.15, so about 2 months ago. After 5 weeks I had Intercourse with my fiance. We didn't use protection but he pulled out before he came. I got what I thought was an extremely light period on the 8th of Jan that lasted about 3 - 4 days, it was really light all the way through. The last couple I've been feeling really off. Sometimes I'm nauseous, sometimes I feel not dizzy but just out of body & Now today, about a week to 2 weeks later after the first time, I started light bleeding again .... is this normal?? Has it happened to anyone else? Should I be concerned?