When to test?

We’ve been trying for 19 months stopped taking pop bc then also. My periods have been irregular like 40-90 days between periods. For the last 3 months they were back on track it seemed. I imagine since they were so off I probably wasn’t ovulating every month. This month at 3 days late for my period I wiped and there was a small amount of light light pink. Now nothing!!! Like seriously NOTHING now 5 days late! Just lots of cm. I’m wondering maybe I ovulated later than I thought and this could have been implantation bleeding?

What are thoughts on this?

When should I test again if so?