Idk 🤷🏻‍♀️

Ok so if I am it’s not a problem but I’m just sketching myself out 😂 so I started my period last month on the 8th. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> is saying I was supposed to have it the 16th, I haven’t gotten it yet, only three days late. I’ve taken like 2 pregnancy tests but both have been negative, is this a thing? Opinions?