Progesterone help

Hi I’m just wondering if anyway can help me please I’ve been told to take progesterone twice a day 200mg from 3 days after ovulation until my period is due or If I get a positive test I go up to 400mg twice a day but I’m just wondering if I test the day my period is due and get a negative test and stop using progesterone will it then take a few days for me to actually start bleeding? Thanks so much