I am 17 weeks pregnant and have managed to keep running (albeit very gentle pace and shorter runs) since my 3rd month. However I have now hit a point where my running leggings are too tights and I am looking for pregnancy specific ones. I can only find quite pricey ones (www.fittamamma.com/ - £50 a pair) or more yoga trousers which are not as warm for running I find. Any tips / advice welcome.