Asthma?

Sky • Expecting baby boy due June 18th 💙
So I'm 5 weeks and lastnight I was in bed with hubby watching a movie and I was having trouble breathing, (I have kinda found it hard to catch my breathe this last week, always getting easily breathless) i started to freak myself out and seemed like I had a asthma attack or something! I had a hot steamy shower and calmed myself down and it went away, anyone else experienced this? Was so horrible :( don't know if that happened because of pregnancy or ...?