Period one day late

I took a test at 14dpo (the day I expected to start my period) and it was negative. I definitely gave up hope at that point since I tested so early with my daughter (ttc #2) but now i’m wondering if it’s possible to not get a positive until later on after your missed period?? I’m 15dpo now and 1 day late and I keep cramping and thinking I’ve started my period but then when I go check — nothing. I don’t want to start feeling hopeful again if it isn’t possible to get a negative the day AF is due and then end up being pregnant. Anyone have experience with this?? My first daughter was not planned so TTC is quite new to me. I am very aware of my cycle and get ovulation pain every month so I am 99% certain of the day I ovulated. Thanks guys🥺