How reliable are these ??
When i went to the docs i gave him all the same dates and he said my due date is 4th may 2013 and that im 4 weeks, but when i use the online calculator i get due date 3rd may 2013 and im 5 weeks 3 days? obviously the doctor would be more reliable i just find it strange the few i have used online have all given me the same date?