My fh wants to cancel our wedding

Your wedding is completely up to you and if you feel well enough then go ahead. No-one can tell you when you can/can't get married!

This is really concerning - marriage should be a mutual decision between the two people who are getting married, not something that is decided on the bride's behalf by the groom and his mother! If he doesn't feel ready to marry, then he has every right to call it off, but he has absolutely no right to decide that you are not ready to marry him, and his mother should be having no input into this at all!

I think you need to have a serious talk with your fiancé about this - without his mother being present! Does she usually muscle in on private issues between him and you?

To be honest, I'd be worried about marrying a guy who let his mother tell him when he could or couldn't marry me anyway - so please make sure you get this issue resolved properly before walking up the aisle. You are (or should be) a team, making decisions together as a couple.