Implant bridge for 3 missing teeth: What’s the best way to do this?

I had 3 missing upper front teeth and decided to go w/ retained bridge implant rather than individual tooth implants, in order to save money. Had bone graft done by allograft on the spot for implant. 3 months later I came for implant placement and was told after surgery that the bone wasn’t dense enough to place the implant so the dentist decided to put 2 implants closer instead of apart like the initial plan. I’m not comfortable to go with this plan because I’m concerned that the bridge will break for not having 2 posts supporting the tooth in the middle like it supposed to, instead it seems like one side of the tooth will hanging by itself. What do you think I should do? Please let me know ? Thank You!