I think im pregnant again

So I just gave birth last month! And i didnt tear so the doctor wanted to see me at 2 1/2 weeks he cleared me told me I can take baths, swim etc i also stopped bleedint at 1 1/2 weeks. Me and my husband had sex and he pulled out but i saw sperm all over my vagina -_- he kept saying he got some inside by mistake but then said he didnt. Ive been feeling sick im only on week 5 of giving birth. I started having brown spotting for a few days now what you guys think?