Conflicted

So hubs and I have one child- she’s three- I’m 31 and conflicted about having another child. I’m not pregnant yet but I’m truly not sure I want to be. I have a little bit of a weight issue- having a VERY hard time getting my weight down. I also have bad sciatica and a herniated disc (L5) that I’ve been treating now for a few months. Which i still have issues with. Medically I’m just scared- has anyone dealt with or is dealing with things like this? Any advice!? A little help could go a very long way with how I feel. Thanks in advance