Veer Ji, great news that you have decided to "become" a sikh. I know so many people (were friends but now people :D ) who went to med school and cut their hairs etc because of the same impression they had as you are in. But i also know a lot of doctors who kept their rehat and are great docs now. Medicine isn't about how you look but how good you are at what you're doing. And i feel no shame telling you, "If you want to look good my veer you are in the wrong profession, especially if you are going to be a ob/gyn. (Hope you heard of something called modeling :D )" You should not be worried about at all that you will have hairs etc, try to keep it neat and tied, wear pagh in a good way try to look proffesional. If you need help w/ anything feel free to ask, or if you need an ameritdhari doc can also make available.
And i don't know where you're doing those procedures but as far as i'm concerned you should be well prepared, masked etc (BSI????). Please pm your questions..