Period tracker app is it accurate??

Moms accurate ba ung period tracker n app?kc last period ko july 1/5 tpos nklgay dito nxt period ko is july 25 ulit dba once a mnth lng period?nlilito n ko widtrawal nman kami wla pa.ko dlaw kn 25 dpat merun na..ung mga last months nman isang beses lng period ko dito sa app taman nman date nya ngworry n tuloy ako 🙂#pregnancy #pleasehelp #advicepls #respect