One week late- irregular periods

Thanieli
This marks a year and 8 months of me being on glow and using the app and over all its been pretty on point... it said i was suppose to start last Thursday today marks one week... since i didnt get it i am tempted to buy a test but i dont want to see 🙁➖❌🚫 on it... i want ✔✔➕😆 i am 25 im healthy.... God only knows how bad i want to be a mommy and carry his blessing... but its just seeing those 🙁➖❌🚫 messes with me emotionally and just ugh... it takes me a week a half to get back on my feet and be like okay... ita fine your fine leta try again... any suggestions on what i can do to increase my fertility... im eating healthy walking more taking prenatal and vitamin D 500 mg everyday