Wanting to conceive

Me and my man are trying to conceive I found out I have pcos and was put on medrozprogestrone for not having a period in over a year three days later after taking all the pills for 7 days I got my period . Today is the last day of my period and for the past three days my doctor has me taking letrozole and I took an opk and had a light line then I took another and it was even darker help????!!!!!