Exercise and losing weight

Kim
So, my husband and I have just started to TTC # 2 but I currently don't exercise at all and I'm quite overweight. It's starting to get me really down and I don't fit into any of my 'fat' clothes. 😭
What exercise is ok when you are TTC (bearing in mind I am currently doing zero). I was running with the pram last year, but it is summer here (Australia)  and really hot, my 2yo daughter is 15kg now, so quite a work out for an overweight and unfit woman! 
Any suggestions gratefully received!