Invisible period 👻

So I had been on the pill continuously for almost three years. After I got off it, I got my period right away, the second month I got it a week later the due date. The third month I didn’t get one but the fourth month I got it around the time it was suppose to come BUT no blood, just CM, it felt like one, smelt like one, but no 🔴. Has anyone had something similar ? I know it takes around 6 months to regulate, just want to get other’s insight.

Thanks in advance.