FTM breathing changes???

M

I’m 17 weeks and am noticing sometimes when I lay down on my back watching tv I feel like I can’t breathe. I turn to my side which helps.. Also I’ve noticed at night when I try to take a deep breath while changing positions I get a tickle in my throat and cough only once... I just had an OB appointment and everything is great but I forgot to ask about this! No other symptoms or temperature. I have anxiety so ever since I felt it the first time now it freaks me out (which I’m sure doesn’t help the breathing!)

I’m generally really healthy, this is my first pregnancy. does this sound normal?!