Is this a safe way to be tanning?

I put on sun screen (SPF 30) and I went outside and layed down on my back so my front was exposed to the sun. I stayed like that for 30 minutes and then I layed on my stomach and exposed my back for 30 minutes. Is this safe to do everyday? I'm not obsessed with like getting golden I am just SUPER white and want to darken up a little bit. All answers appreciated, thanks.