Ovulated early??

Steph

So the past few cycles I have used the LH strips and the clearblue advanced and I always get my peak around CD16

But this month I got my peak on CD13 and I have kept testing since and it's still dropping

Is this OK to ovulate this earlier than usual??

I have been unwell the last few days with a sickness bug too

Not pregnant either as I have had bloods done and a test done through bloods

TIA 😊