Digital Ovulation Test Question

I started testing on cycle day 10 because my cycle has been a little bit weird since I went off the pill. I've used the first morning pee every day. I got a smiley face on day 14, but my cycles since I went off the pill have been 36-40 days, so this is earlier by about 2 weeks than I thought I would be ovulating.

Does the regular Digital Ovulation Test (not the advanced one) use the previous day's test results as a baseline? Or does it use some other mechanism to test for the LH surge?

Also, if I hold the test in my stream for too long, do I risk a false positive?

Of course my husband and I acted like I was ovulating, but I'm wondering if I should keep testing in case it was a false positive.