Pregnancy after surgery...

I had my gastric bypass Jan 13, 2004 and now I'm expecting a baby in February 08. Has anybody else gotten pregnant after surgery? I'm a bit nervous now as my blood work came back and showed I'm very anemic and low blood count overall. I have been packing down the iron rich foods and chewable pre-natal vitamins and slow release iron pills twice a day (all per my doctor). But I have been so exhausted! This all puts it in perspective. I've gained 3 pounds and I'm in my 16th week. Any advise would be great! Thanks!