Help 6 weeks PP
So first off please no lectures on how I should have waited to have sex or risk of infection I’m simply here for advice! So I had my son on May 28th had unprotected sex on June 16 my husbands idea of course lol anyway I’m 6 weeks pp and I’m getting positive pregnancy tests since last week! Well I called the dr they said its no way left over HCG that it’s either a new pregnancy and a piece of placenta left inside well I had an ultrasound yesterday and they don’t see anything they did blood work and said it was negative I keep testing positive on my tests though this one is from this morning anyone have any idea what’s going on??