I’m about to be 8 weeks pregnant.

I’ve been having a hard time struggling to catch my breath! Like I have to inhale 2-3 times to catch my full breath or yawn to be able to breath good... from so much struggle my chest is starting to hurt. I went to the ER 2 days ago because this has been going on for 6 day’s now... they said every is normal... but i feel like ima stop breathing anytime now... has this happened to anyone ??