HCG not doubling- any ideas?

Isla

Here we go again: after a beautiful baby boy conceived through <a href="https://glowing.com/glow-fertility-program">ivf</a>, I fell pregnant naturally the first period after stopping breastfeeding but I miscarried in February this year at 8 weeks- embryo stopped growing at 6w. Now I’m pregnant again naturally, first HCG at 4w3d was 1380, but at 5w1d only 3020 but progesterone 56. I’m preparing myself for another miscarriage, considering also my age- 43.

Any positive outcomes with similar numbers?🤞🏻🤞🏻