AF late but still BFN

Ems

Went to bed last night thinking I'm bloated and I was like maybe test tomorrow!! Woke up this morning and was like boobs feel fuller. When I came down to the kitchen my husbands eyes went straight to them!!! So I skipped off to do a test (af is a day late) I was convinced I was going to get a positive!! I didn't I got a BFN!!

AF is always on time. Could I have tested too early even though my regular cycle is 28 days and today is day 30

Any thoughts??