Need help asap!

Ok so my period is late do to glow and i added another app to see if they would add up to the same day of my period. Well the other one said i should start my period today but glow said ive already been late three times this month and ive had the app for awhile now. Anyway this isnt to start app drama due to glow im late by 3 days for my period but it just keeps pushing it forward. The other app said im supposed to start today but either way still no sign of aunt flo. Ive took 4 pregnancy test and all have been negative. I havnt really had any signs of period or pregnancy but that my period is late. I havt done anything out of the abnormal than usual so im confused. Ive heard a few stories where some women won't know until later on in pregnancy that a positive will even show up. Idk usually my period is on time and right on time with glow. My last pregnancy put me in the hospital right when my hcg level went to 28 my body was also going through a medical problems at the time as well. Anyone please help i want to get excited but at the same i dont because ive been ttc for the past 3 years now.