5"7 and 98 lb. 7 weeks?

Hi, Yes I weigh 98 pounds but the doctor said I was healthy I just can't gain weight although I eat A LOT. My period is usually regular but this month I haven't started. My last period was May 9th. I was suppose to start June 9th. Its now almost the 30th of June. I have been reading websites that say that its not likely to show at 7 weeks. I was just wondering If because I'm so tall and skinny. If I could be showing already. Because I've had a little bump all week and my stomach is sensitive to the touch.