okay so I need advice. when I was 6 weeks post partum I had sex. we only used the pull out method…

okay so I need advice. when I was 6 weeks post partum I had sex. we only used the pull out method but he pulled out awhile before he ejaculated. now I'm almost 7 weeks post partum and I've been having snot like discharge and today it was alittle brown. I'm not feeling extremely nauseas. I took a test but it said negative. any advice?? idk what to think......