TTC for almost two years...?

my sister has been trying for 17 months now. she was very down and depressed for a long time, she charted and everything else. the only person she told was me, so she had it rough with no one else to talk to... but, her and her husband took a vacation. left all the charting and everything behind, and just forgot about it. she was gone on her fertile days, so she hopes that she caught her egg, which i hope she does too. i guess the only thing i can tell you is just don't overthink it. don't get stressed out over charting... and i hope it works out for you. seeing my sister try for so long makes me sad, and it's really made me hope that other ladies who want to be mommies get their dreams. i know how it must feel for you, i can't even imagine my sister's heartbreak... but please stay optimistic.