ttc help

Aisha

i've been trying to conceive for 3+ yrs. i have irregular cycles and my doctor prescribed progesterone medicine to make my period come on time and also letrozole. last cycle i took both of them. now i was suppose to get my period today but i didnt. should i take pregestrone again? im planning on testing before but since my cycles are irregular im afraid.. can it cause a miscarriage?