Help DPO?

Can anyone help me, this is the first time I’ve ever tracked ovulation so I’m not aware of what dpo I am nor when I should test.. My period in November was 25th-30th I believe and I didn’t get December but in January I started my period on the 22nd-27th. I got a blank circle on my clear blue advanced digital on the 11th of February and a blinking smiley on the 12-15 and finally got my solid smiley on the 16th and got a blank circle on the 19th if that helps at all. Thank you! for anyone that can help me with this! I don’t want to test too early and get my hopes up