I need some pinponters to lead me in the right direction!

Are there any websites similar to fertility friend? How come each ovulation app gives me different ovulation and fertile days?

I'm stressing out today because I'm afraid I may not be fertile this week even though my doctor says I'm ovulating.

I know the apps aren't accurate but I'm having trouble calculating my cycles from one period to the next. These apps keep giving me fertile days, and some are giving me this week.

I really don't know how to do opk strips and so on. I'm just really lost and confused! 😕