2nd baby and progesterone?

Cassandra • 26. Married. Beautiful baby boy 08-03-2019

Just found out I’m pregnant and waiting to call doctor on Monday to get on progesterone supplements. I’m only 3 weeks and 4 days and haven’t had my period yet. However with my first pregnancy I had super low progesterone and got on supplements, now have a healthy almost two year old. So nervous that I won’t have gotten supplements in time.