Help please 😔

Sabrin

Has this ever happened to anyone before I'm ttc we've been trying for 7 months now and I don't think I can ever get pregnant I'm taking vitamins and everything the doctor told me to so basically every month my period changes the length cycle it was 33 days then went to 45 and then 33 again and last month 21 so I don't know when is ovulation and I never had the egg white discharge to know is it normal did you go through this need help please I am going to gynecologist but she only told me to keep talking the pills