I totally agree with the others - pelvic instability! Have suffered this to varying degrees for my entire pregnancy and know of women who have suffered it for years so believe me, invest in your health now - if you can't financially then practically!

I got to the stage where I couldn't walk up the stairs! I was told to keep walking to an absolute minimum which has been a real pain!

On the up side things did get better for a while and now not great again but at least I know what to do and that it can pass.

I saw a women's health physio who was great. Yes expensive but really helped. The belly belt she gave me cost $40 so if you can't afford more than one physio appointment I'd get that! It stabilises everything and they are actually quite comfortable when you get used to them! I wouldn't buy one without knowing how to wear it that's why I recommend at least one visit. Make sure they specialise in pregnancy issues though.

Oh today someone even said accupunture helps pelvic instability so I'm trying that next!

Another thing you can do that's low low cost is ice it 3x daily for 20 minutes! NO HEAT! Heat will loosen everything so you must use ice only. Hold it on the area for that amount of time morning noon and night and it will work wonders. Avoid hot baths and all the other things the other people have said!

Be very careful when doing anything - dressing etc (do it seated). The aim is to keep your legs closed