Chemotherapy Messed Me Up

Had to be on chemotherapy as a pre teen and worried I may not be able to have kids?  I didn't have my period at all during the 6 months of chemo and after it was very irregular.. I get it every month now but I never know exactly when I'll get it each month.. It's usually medium flow for 2/3 days and then it stops for a full day then comes back for a day.. so annoying