Ovulating?

Erica

Can you ovulate after a missed period? I know it may be a dumb question but I’m not really sure how it works. My app says I’m late by 13 days and I’m in the green ovulating stage. I’ve taken a million pregnancy test and they’ve all been negative. Got blood taken a week ago and it was also negative. I’ve been nauseous every day and bloated with indigestion. Wonder what’s going on?