When to test?? HELP!

Kaylynn • Infant loss at 4 months old👼🏻💙

This is my first time using opks I got two different brands to try one digital and one not. But my question is when do I start to test? My cycle ended yesterday and is very irregular. Do I test now, wait a few days? And what time a day? I’m so lost ans have no idea where to start!