Need advice.

Hey all so i am not really sure how accurate glow is i only had this app for a few months well since January. But according to the app i was suppose to have ovulated on the 27th and made love on the 17th of March. I was suppose to get my period 5 days ago. No sigh of af and really no signs of pregnancy only thing i can think of is that i am stuffy my when i blow my nose it looks as if i have a sinus infection but i think its from being stuffy and i just have been tired lately like i have no energy at all. Has this happened to anyone . again i plan on testing will have to pick up a test tomorrow. But i am jist curious to see if anyone has went through this. Ty