Low Progesterone

Hello. I am currently 5 weeks 3 days. Previously had a chemical pregnancy last month and got pregnant immediately after with no period in between. Ultrasound yesterday showed a gestational sac + yolk sac. However progesterone is low - at a 7. I just started oral progesterone 200 mg today. Hcg was 1300. Because of the long weekend I don’t have repeat labs till Tuesday. Does anyone have success stories regarding a low progesterone and oral pills working quickly or is it too late? I’m so worried this will end in a loss and freaking out :/