Stress, low hcg, and more stress

On Wednesday, September 11 I got a very unexpected BFP! I have a history of low progesterone in both pregnancies so I instantly called up and asked to check levels. My hcg was 20(actually higher than my daughters was) and my progesterone was only a 4.5. Friday I repeated the labs and they went up to 30 and my progesterone dropped to 1.7. Obviously I was scared at that point. I started Prometrium that night however come Saturday I began spotting pink and brown. Not a huge concern until early afternoon I began lightly bleeding red. Sunday I had the same thing. Today it may be a bit lighter and I had my labs rechecked. Progesterone hasn’t come back yet but my hcg went up to 58! Not *quite* doubled but close and both me and my OB were shocked and happy. But I’m obviously cautiously optimistic. Has anyone had this happen before and had a good result? I’m hoping and praying that I just ovulated late (August was the month of stress I swear) and I’m not as far along as I thought. Thanks for any input!!