Tips for ttc

I’m 21 and I’ve been ttc for about 4 months, I’ve tracked my period for about 6-7 months. My periods are sort of irregular anywhere from 1-7 days off. I don’t know when I’m ovulating I really think the predictions on these apps aren’t correct like my ovulation is off or something. Any tips would be welcome also send baby dust my way!! Thanks loves 💗