Just curious..

I’ve been using the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> for the last 5 months. It’s been spot on with my cycle days and ovulation days. I’ve confirmed those days using opk’s. I’ve been trying to have as much sex during my fertile window per the app. This month, the days the app says I would be ovulating, each test has been showing negative ( and hence the app pushes my ovulation day back)

Could this be an early sign of pregnancy?