Period didn’t show!!!

Julia

No period. Scheduled my first prenatal visit for 11/8 I’ll be 7 weeks 2 days. Considered high risk because i delivered my daughter at 26&3. I have to go in to the drs office today at 1 for progesterone levels check and probably have to get progesterone shots this pregnancy to prevent premature labor. Anybody ever get the weekly progesterone shots ?