Purchase and Sale Agreement Newbie Question

[Will K]

So I put an offer in on a house a few weeks ago. A week ago the RE agent tells me that the seller is considering my offer, but is also collecting other offers. Today the RE agent tells me she is emailing the P&S agreement over, and that I need to have it signed and turned in by Friday. She is claiming that the property has other offers, and she is expecting these other bidders to also turn in signed contracts on Friday, and that if I don't have mine turned in by then I will not be considered.

Is this the typical procedure for a seller accepting offers on a property? Wouldn't the seller only offer a P&S agreement to the one party she was going to accept an offer from? It seems weird to me a seller would "collect" multiple signed contracts. Is this just the RE agent trying to pressure me into signing something ASAP?

Also, quick side question. The RE agent tells me she is sending over a "standard" P&S agreement for Maryland (I haven't seen it yet). However, I want to make sure that if something doesn't check out, like the rents aren't what I was told initially, or the seller can't/won't provide proof that the current tenants are paying on time, that I get my earnest money back. Would these be unusual addendums to put into a P&S agreement? I am planning on having a RE lawyer look at it and answer these questions, but I wanted to get BP's feedback too.

Thanks!