UAN - selected by a new company and I didn't tell them about my previous employment

Hi, I have worked in a company for just 2.5 months it was my first job, now I have been selected by a new company and I didn't tell them about my previous employment. Since I am a fresher so I didn't want to show it in my resume. Will there be any consequences if the company gets to know the same after I share my UAN. Please help

In general no one minds you having more experience than you have shared.
But it depends on what you have said, why you hid the employment and the mindset of the new employers. With the little information you have shared, I can not comment