Will my pf account expose me?

Hi, I had joined a firm 'A' 2.5 weeks back. I received offer letter from firm 'B' 2 days back so I resigned from firm 'A' today. I didn't tell firm 'B' that I have already joined 'A', they only know that I have offer from them(because I deliberately told so). Now firm 'A' is telling me to serve mandatory notice period of one month and the last week is coinciding with 1st week of joining firm 'B'. Although I'm trying to payout/settle the notice period.

Now the thing is I believe that firm 'A' have made my PF account (as I'm a fresher) and thus generated a UAN number. When I'll join firm 'B' they will come to know that I was employed and have some money in pf account and would suspect that I was employed which I didn't show in background verification. Even if I later admit that I was indeed employed, my relieving letter would expose that I resigned because of higher studies which I have told as reason of resignation to firm 'A'.

Is there any way I can get rid of pf account created/ UAN number? To firm 'B', I'm a fresher. Will they ever find out that I was employed and the company name without my consent? Can they fire me for this? Both 'A' and 'B' are big companies with 80k+ employees. Please advise me I'm just fresh out of college and this have no idea about anything. Thankyouu.