please help!

Brandi • My name is Brandi and my fiancé`s name is Joe. I`m 23 he`s 25. TTC baby #1. I`m a hair stylist and he`s in flooring.
So I ran out of ovulation tests. I ordered them but they haven't come yet 😤 so I was wondering if I have regular cycles and have been getting a positive OPK on the same CD for the past three cycles, can I assume it'll still be on that day?