I’d say a couple more days. When I learned i was pregnant with my son I waited til I was about 4 days late because I had had a 3 day late period in the past. But my period is also usually always on time. But for you, you said yours is inconsistent so it’s really up to you how long to wait.
Small note all pregnancy tests are the same, don’t spend more money on a name brand one. If you’re usually inconsistent and you’re stressed it’ll be late. But my pcos trick is whatever day you choose to take it will be the day you start your period every time and you’ll feel like you wasted money 😭😂