Pregnancy after stillbirth!

Our son was born sleeping on August 5th. Our doctor told us we could start trying again so we did. I ovulated around the 28th and I’m due for my period this weekend. I wasn’t feeling right since around Thursday of last week and was getting SUPER faint positives on 3 different kinds of pregnancy tests.. so I went in for blood work on Monday to test my HCG level. They said “No, you’re not pregnant”. They also said “Your progesterone level is indicating ovulation.” I told the lady I had ovulated almost two weeks ago and she said that was weird. Well... I just had a hunch something was still going on so I came home tonight and took another test. 2 hour hold.. not morning urine. I got this. I think the doctors were wrong. What do you think?