is it normal to only get one positive OPK?

i’ve been testing since cd16 and i finally got an almost positive on cd19 around noon and a definite positive on cd19 late at night. but then on cd20 i tested again around noon and it was negative. i tested again for a couple days after and they’ve all been blazing negatives.

i keep seeing people’s tests and stuff and it seems like everyone at least has two positive tests, some even getting positives for up to 3 days in a row, so i’m very anxious about only getting one...