It's just melanin, nothing to worry about. I'm covered in freckles I call the sun kisses, and I have a few that have never seen sunlight. I've gotten more with pg too, which is apparently normal. But do remember that not even clothes fully stop uv penetration. So when it's really sunny it's best to seek shade, and only get sun exposure when uv rays are lower

Freckles tend to be different to moles as well.