TTC SAD & FRUSTRATED

I am so frustrated! May of this year my doc gave me the call clear after my physical to get off the birth control so we can try for a baby. By July I was pregnant but MC at 8 weeks. Here it is 3 months later (and tons of people telling me how easy it is to get pregnant quickly after an MC) and my heart breaks every time I see that negative reading. This is my 2nd MC...first one happened 2 years ago from a previous relationship. Doc seems to think I'm not producing enough progesterone to make pregnancy stick. im 38 I want to be a mom before I'm 40 and still have the energy to be a mom...