How to remove period days?

Monica • I`m 22. Engaged to my partner of 6.5yrs. We have 2 son's, Samuel Reece joined heaven at 20weeks gestation to spont preterm labour, Vinvent Xavier who is now 3, was 7 weeks early, TTC#3
I put into glow that my period didn't start but it still has the pink. It's been 53 days since my last period started I'm not pregnant i tested yesterday with a BFN but yeah it's treating it as if I'm on a normal cycle because it's put in my period days from it's estimating when i should start. How do i change this?