Baby has a small head..

Joleesha
When I went for my gender and measurement ultrasound at 19 weeks I was told a few weeks after that I had to go to another ultrasound because they "didn't get the right measurements for her head".. Today I went for my second one and they said I needed the second ultrasound because her head measurements were small and that they are still small in the 3rd percentile. I'm beyond freaked out right now and just thinking of the absolute worst because they said that is really small. They did tell me that her brain structures looked fine and that she may just have a little head. I just don't know what to expect because I never had this problem with my first. Anyone else been told this before and still had a perfectly normal baby????