Negotiating an offer, is it too late? after 7 years as a payroll clerk

I received an offer as a payroll clerk and I think the pay is a little low. The hiring manager was friendly and open. Did it backfire?

I thanked them and said I was excited but hoped we could talk about the pay. They came back with a bit more.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.