Grade 2BC embryo

Has anyone had success transferring a grade 2BC embryo? I just had a chemical pregnancy after transferring a grade 4AB embryo so now I’m worried that transferring a lesser grade definitely won’t be successful (my doctor thinks it was an embryo issue since I got pregnant our first try with my son during a fresh cycle 16 months ago). My husband and I are trying to decide if we should transfer the 2BC embryo or go straight to a fresh cycle to try and get more quality embryos as we don’t want to pay for another failed transfer and then have to ultimately pay for another full round of <a href="https://glowing.com/glow-fertility-program">IVF</a> 🙆🏼‍♀️