Is it safe to get a salt scrub while I'm pregnant?

Yes. Since it is a topical treatment, you should have no concerns about a salt scrub. I would say it's recommended in that you will be taking time for yourself and relaxing. Enjoy and find regular times to pamper yourself, and include your partner at times as well!
Salt Scrubs. I have not heard of any harm from such scrubs. It is unlikely for salt to get absorbed through the skin.