why cant i breath!?

Ok now i could ask my MW by seen as i know that some of you lovely ladies will be able to answer my question i shall ask it here
Why am i finding it so hard to catch a breath!! like i have to enhale more often than usual (every few breaths!!) and i can never seem to get a good breath!! this has been going on for a few weeks now!!
Its a horrible feeling and no matter what i do it doesnt go away!!
I did have this when i was pregnant with Bay but i remember very well that it didnt set in till the very end and only when i was trying to sleep! and my MW had told me that it was just bubs pressing hard up against my breathing bits but im only 17 weeks now and bubs is sitting way up higher than Bay did but still dont think that can be it...
Can anyone tell me whats going on!!??

Nop i never had asthma but i thought an inhaler would help when i was having these problems with my son but it didnt help
I wear farely baggy shirts too so i have no idea

I dont have any allergies except maybe the house work!! but it happens at random times.
Its calmed down a bit but hasnt fully gone away at this point, when i first put the post up an hour or so ago i was struggling a bit to breath!! while i typed!!!.
When i had it later on with Bay i would start freaking out because the panick would set in that i couldnt breath much at all but after a while i come to know that it would go away after a few hours and just to concentrate on breathing. I really hope it doesnt get worse as time goes on

I had the same as you baysmum when I was around your stage. It was like I had to take really deep breaths and it still didn't feel like I was getting enough air. My MW said it was just because everything was moving around to make room for bubs and my body just needed to get used to the changes. It went away after a while but it was awful and there wasn't anything I could do about it. Hope it goes away soon.

Yeah I remember that now getting all stressed about not being able to breath which makes it worse. I meant to say it was tight shelfbras or bras which were too tight.

Get your iron levels checked - could be maybe you are very low and therefore your body isn't able to carry much oxygen - make syou feel very breathless. ( i think that's how it works.. has been a while lol)

i actually found my asthma disappeared while pregnant - but i still had the sensation you had - it doesn't feel like asthma, well not to me anyway - my MW said it was baby pressing againest lungs and should go away as baby drops...onto your bladder and then you just have to pee every two minutes.

I think it has something to do with the hormones - maybe progesterone (?) making you more breathless.

Yip my MW couldnt beleive it when i told her what my iron was when doc did it at 6 weeks so she rung my doc and had her fax over the results!!! lol she said that its meant to drop a bit as the pregnancy progresses and she was going to put me on some kind of tablets to help store it just incase it went right down, not sure why though cos iv never had an iron problem not even when i was pregnant with my son!!