Pregnant after birth?

Hi mommas, I’m 3 weeks PP and I know I shouldn’t have sex this soon but at 2 weeks PP my man and I started having sex again and we haven’t been using protection..please no bashing I know I wasn’t supposed to. But what are the chances i am pregnant? I’m breastfeeding and i have heard it can delay ovulation. When’s the soonest I can find out I’m pregnant? Is there still HCG in my body? Thanks.