Someone please help!

I ovulated on the 28th of February. We have been ttc and I’ve taken some text they are all negative. I’ve got a 30 day cycle so when would my next period actually be due I’ve tried looking it up on the internet and I know it seems like a stupid question but I can’t find the answer. I just recently downloaded <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> so that’s why I’m clueless of when my actual period is due.