I'm 26 weeks pregnant today and for the past couple of weeks I seem to be getting out of breath for no reason at all. I haven't put a lot of weight on and my bump is still fairly small. I can be sat on the sofa watching tv and suddenly I feel like I've run a marathon. It's the same when I'm laid in bed I get heart palpations and have to sit up and steady my breathing. Is this normal or should I mention it to my midwife at my next app? Totally clueless first timer here!