Leaves turning purple in week 3 of flower just wondering if it’s normal or if there is something wrong any advice would be appreciated

That actually looks kind of neat. The leaves and buds are not showing damage and the coloring looks like it might be natural.

Does your temperature drop at night? Cooler night time temperatures can cause color to show up in the leaves, but I think that's ok.

If you don't think it's natural or temperature related then let us know what you are feeding her and the type of soil she is in.

Double butter general organics

Can we see some pictures? And some more information on the strain and what you are feeding her would help.