feel so fat

so I'm already a big woman size 18 and work as a community care assistant I'm a walker so I work all day long just found out I'm pregnant still earlt days but my legs are that fat I've been chafin and I'm in agony now I have like a friction burn on my thigh any ladies know a way of walking and easing this I wish I wasn't so fat n big but I suffer from pcos and my weight as been up an down since I was 18 lost 6 stone and became slimming worlds woman of the year in my group but again gained it all back now I can't even loose a pound anyway any methods of easing the pain or friction I'd love to know x