Chart questions

I know that I haven’t been charting for long enough, but I got my first positive OPKs a few days ago and I’m back to getting negative this morning. I got my positives on DPO 1 and DPO 3. I’m thinking the app is confused about me 😂 I thought that a dip in bbt should be followed by 3 days of higher temps to confirm the ovulation. I’m confused how this morning my temp went down a little. If tomorrow is above that dip, is it going to confirm ovulation? Just looking for opinions. Thanks ladies!