Early ovulation

So I got my iud(mirena) out in dec after having it in for 15 years with no period every month since December I get my period like clockwork my period lasts 3 days and I have a 30 day cycle. I’ve used the clear blue advanced ovulation test every month and it’s always the same I ovulate on day 15, this month i thought I would try easy home ovulation strips and it said to start doing it the day after the end of your period so yesterday was day 8 of my cycle and the strips tested positive but the clear blue was negative so today I did both again and both were at peak fertility so I’m ovulating early this month is this normal and thank how I started the ovulation strips or I totally would have missed it this month!