What are my rights if he put in our pre-nuptial agreement that the house is not marital which I signed?

It states that he owns the house, but did he own it before you were married? Need more information to see if the pre-nupt, at this portion, would be invalid. If he did own the house before knowing you, he may have a leg to stand on, but again, not enough information here to determine.

If you were represented in the negotiation of the pre-nup and all of the assets were disclosed, then the pre-nup would probably be valid. Even without a prenup, if the house was owned by him prior to the marriage., it is not marital property. Only if there has been a very long term marriage and marital funds were used to pay the mortgage as well as any improvements might there be an argument ( not to say it would win) that the property has been transmitted into marital property.