Getting dizzy in the shower

Tiffany • 26. Married my high school sweetheart 6/20/13. After two miscarriages we are now anticipating our first in October!!
Anyone else get dizzy in the shower? Every time I shower I end up becoming so dizzy I have to finish sitting down. This morning I even blacked out for a moment. I have asthma so I already get winded if there is too much steam. 
A co-worker told me her doctor had her take baths, but she was bed rest for complications. I'm going to ask my doctor at my next visit, but I wanted to know if I was the only one.