I panicked during salary negotiations! How do I accept position even if they decline my offer?

I am fresh out of college, 10yrs work experience (hourly retail supervisor /optician). I interviewed for a position on thursday in my field, got the job offer the following Monday. I have been playing phone tag with HR and a salary was presented. I panicked- said that I have another offer through my fathers company that came up recently but it was for a job not in my field. I said that I would rather work for their company and I just wanted to make sure once I started a career I am happy with benefits ect, because I plan on being there long term. I asked if they would be willing to accept XXX dollars. HR asked this exactly "Is that a sticking point for you?" and explained that she had to forward it on to the supervisor working above me for approval. Q: Did I just tell her I would only accept that amount? Will they retract the offer? If they call and say they will only offer the original amount- how do I accept without looking like I was just messing with them? Also, I must say the phone tag with HR has been a nightmare and I really feel as though I have come off as flakey as a result.