Hun trust me it happens to most of us! When I was about 32 weeks I had a banana milkshake (with this gross natural fruit laxative stuff in it), well I gagged on it and vomited all over myself and also wet myself for good measure! It's kind of funny, I was taking the fruit stuff to fix one pregnancy problem, but not only did it not fix the problem it created another pregnancy problem !!!!!
You just got to laugh - for me it was terrible right after the birth too, but then the ol' pelvic floor muscles begin to recover - thank goodness!
Rach xx