Ovulation day??

𝓑𝓮𝓮

I'm really confused!

I just started testing with OPKs this month at first

they were super faint then after work on the 19th I got a blazing positive so glow set my ovulation day for the 20th. On the 20th I took another opk and it was starting to fade and glow changed my ovulation date back to the 19th? I feel like I ovulated on the 20th? Any ideas?