Questions about when to test?

My period isn’t due until around August 10th, so I should’ve ovulated some point in this past week (not doing opk’s so I wouldn’t know for sure when I ovulated, just going off what this app says). The only thing is that my cycles are very irregular so this is just very lightly estimate as to when my next cycle starts. My last period was from July 10th-14th.

My main questions are: Would it be possible for me to have ovulated earlier than last week? & if so, Is it possible for me to get any sort of positive (even faint) at this point or would it be way too soon?