Off period

Hi ladies,

Looking for advice/reassurance. I had my period start a week early this month on my birthday :(.

I wore a pad the first day and hardly anything which is unusual for me as I’m usually exceptionally heavy. The following day we had a spa so wore a tampon again not full after 8hrs. Next day there was nothing and through that night. I then came back on luckily I had kept a pad on. Then off again and now today I’m bleeding again! But still exceptionally light.

Also feels like I’ve torn but don’t know. Really gutted as that puts me as a 21 day cycle so fertile window starts today and we can’t baby dance as I’m still bleeding.

Is this actually normal to come off and on like this? And what could it mean?