How do you know when you ovulated?

Bella • Inlove with my man 21 years young Engaged 💍 & Pregnant with baby # 1 🤗🤗
Okay my period came on Jan 22-25 so I suppose to ovulate Feb 7 witch was today I had sex twice today and the last pass couple of days but idk if I ovulated somebody please let me know something 😖