Three days late two negative tests

Hi! For some back story, I was diagnosed with PCOS about a year ago and have since lost 40 pounds and regulated my cycle pretty much completely.

I got pregnant in April and had a miscarriage at about two weeks. My doctor advised to wait another two weeks before attempting to conceive again, so I did. The first week of June ended up being my ovulation window and that was when I started trying again. Now it’s the 21st, my cycle was due to start on the 19th and nothing, and I’m never really late anymore.

I’ve taken two pregnancy tests thus far and they’ve both been negative. My doctor also prescribed me progesterone due to my last pregnancy being a miscarriage and told me to start taking it as soon as I miss my period to avoid another miscarriage. I’ve started taking the progesterone over the last three days, but the negative tests are worrying me/making me wonder if the progesterone is delaying my cycle further.

Any insight or advice at all would be super helpful. Thanks so much!