Bbt, progesterone and pregnancy

Alexia • My husband and I are both 29 yo. We have been married 2 years. Had a miscarriage fall 2015. Trying to have a baby again :)
I just found out I'm pregnant with my first (4 weeks and 1 day) and the doc said they don't need to do blood work. I had a miscarriage last fall but they never checked progesterone. My bbt shot up to 98 after ovulation and now it is down to 97.5. I'm just worried that if that was the cause they won't catch it. I have also read to stop temping after you are pregnant. Anyone had any experience with this?