Low progesterone?

So after a miscarriage last year at 9 weeks, we have been trying and hoping for a while now. A few weeks ago we got the BFP we’d been praying for, and the app and my last missed period has me around 7.5 weeks. I got my prenatal labs done yesterday and received a call that the blood test is only putting me around 4 weeks pregnant and that my progesterone was 8.1 instead of 11 where it should be for first trimester. They’re giving me medication to take vaginally until 11 weeks as long as my scan on Monday goes well. I’m just so worried now! Is it ectopic, did we only make it to 4 weeks, will we go any further? Has anyone had low progesterone or anything like this and have their healthy happy baby?