Should I be worried?

She’s 20 weeks and still can’t really roll over.

She tries to kick her legs over when she’s from belly to back and can go to her side

And same thing back to belly, she goes to her side

How can I help her? /:

We do tummy time 1-2x a day for about 15-30 min each just depends how she’s feeling.

She loves being on her tummy she can scoot to grab toys. Just has no interest in rolling.

She loves sitting up and standing...

Am I just worrying too much?