13 dpo.. progesterone?

Sarah

Hey ladies, I am 13 dpo and I have a vvvfl... I had a MC last month and my doctor told me when I got my next positive to call and we would talk about progesterone to see if I need a boost... I have a history of MC and I got pregnant the very month after I had a MC with my last son. My question is, when did you call your OB to tell them you got a positive test? My line is still very faint but if she's going to start me on progesterone I don't want to start it too late? Thanks!