PLEASE HELP!!! I am very confused!

A
Hello everyone! I really really need some answers because I am pretty confused! So, my last period came on Jan 15th! GLOW says that I am ovulating TODAY, cycle day 11th! 
So I have been testing since cycle day 8! And it was negative of course! Yesterday I tested as I felt kinda crampy Monday night! So yesterday cycle day 10 I had 2 OPK's super super positive! And I was so happy! We BBD last night! 
Today, though, I took another test, like 20 mins ago and it was negative! 
How come I ovulated so early? And how come today was negative? Usually when I ovulate I have 2 days in a row positive OPK's! Sometimes 3 days! 
Any opinions? Has any of you had this? 
Thank you in advance and God bless you all! ❤