If you've not had asthma in the past this is unlikely to be asthma. If you are not having difficulty breathing and feel that you're getting enough air I would wait until morning and call the advice nurse who would then direct you to someone else if your ob/gyn couldn't deal with it. Or I'd call my gp advice nurse.
Or you could call your insurance company's advice nurse now. They're located at the hospital in which your doctor treats his patients. When I had Blue Cross they sent me a letter with a magnet giving the advice nurse's number. You may also find it in the insurance booklet listing services.
You can look up the hospital's number and ask to speak to an advice nurse. Most hospitals have an ER nurse respond to those calls.
I feel like I'm wheezing sometimes when I'm congested with a cold or allergies. Could that be what is happening with you?
My granddaughter has asthma. An attack does become apparent when she wheezes but in just a few minutes if she doesn't use her rescue inhaler she has to gasp for air. It's obvious that she is not getting enough air. The gasping gets stronger. If all you have is the sound of wheezing you're alright. But if it gets worse so that you have to work hard to breathe go to the emergency room.