Unfortunately being pregnant or having just given birth does not keep you from getting sick just like any other person. You may just have a stomach flu, which will go away on its own with time. I would continue a very bland, mostly liquid diet until you van hold down solid food. The only issue would be if you had delivered by cesarean section, as surgical complications can cause vomiting and can be potentially more serious. If you had a c-section, call your doctor right away to see if you should come in for an office appointment, if not, try to stay well hydrated until you can eat solid food again. I hope you feel better and this answers your question.