There are obviously subtle differences in every state’s body of law regarding prenups. However, given the time frame, if you were to go through with signing, you would likely have a good chance of having the prenup be deemed unenforceable down the line due to duress, not consulting counsel, lack of disclosure, etc.
I don’t know where you are located, but in New Jersey, in order to later find that a prenup is not enforceable, the party challenging the prenup needs to prove:
a. [She] executed the agreement involuntarily; or
b. The agreement was unconscionable at the time enforcement was sought; or
c. [She], before execution of the agreement:
(1) Was not provided full and fair disclosure of the earnings, property and financial obligations of the other party;
(2) Did not voluntarily and expressly waive, in writing, any right to disclosure of the property or financial obligations of the other party beyond the disclosure provided;
(3) Did not have, or reasonably could not have had, an adequate knowledge of the property or financial obligations of the other party; or
(4) Did not consult with independent legal counsel and did not voluntarily and expressly waive, in writing, the opportunity to consult with independent legal counsel.
If he forces you to sign by threatening not to go through with the wedding, that’s probably a sign to you that there are other issues. However, if you do sign it, use the above information to try and protect yourself. Obviously, I urge you to contact counsel, but if you don’t, make sure the provision about waiving your right to consult with counsel is not present (even if you don’t actually consult an attorney). Furthermore, don’t agree that he has provided you with full disclosure of assets, etc. – because you do not have enough time to explore that issue. Sorry if this is confusing, just trying to get you an answer ASAP.
*This should not be construed as legal advice.