TTC but want to also lose weight

Hi everyone this is my first post so please be gentle with me.

My husband and I got married nearly 2 years ago and over the last few years Iv put on some extra weight. It gets me down everyday and Iv joined a slimming club. Wev started TTC and I’m desperate to fall pregnant but also really want to have lost about a stone and half aswell. I carried quite big with my son so worried how huge I could get this time around .

Would you put baby making on hold and lose the weight or just try losing whilst trying for a baby and see what happens?