I drank on Saturday, probably about 4 beers and have an ETG test today which is Monday, will it show up?

Four (4) beers at 48 hours is a close call. Could go either way. Most of the pertinent research (as ex. See Wojcik & Hawthorne Table 3) indicates that you should be clear, but EtG varies widely between individuals. Looks like the odds are in your favor.

Please advise how it turns out.

I've personally had tests come back at levels over 1,500 EtG after what I'd calculated was over 80 hours out - weigh your risks and remember that games are often lost, not always won -

I have question. If I drank a 40 of coors light (which I think is equivalent to about 3 and a half beers) on Saturday night at 10 pm. Will I be okay for a EtG UA tomorrow (tuesday) at 10 a.m?