Saline Sono after chemical Pregnancy?

Hi-

Hoping to get some insight about your experiences with chemical pregnancies. I just had a chemical pregnancy ( assuming very early on because AF was only 4 days late when I started bleeding and my beta levels never got higher than 13). My RE is recommending that I have a saline sonogram, but I’m reluctant because I just had one last month, immediately prior to getting pregnant, and everything was fine. She says there’s a 10% chance that there could be a polyp as a result of the CP.

Anybody else have their doctor recommend this after a CP? It seems as though anyone I ask went straight on to trying again, without any testing. Any insight would be much appreciated.