Solid and getting bigger!

Marie

My tummy is now really solid and is getting bigger quite quickly. I can't just be putting on weight, as I haven't been eating any more than I usually do. I am somewhere between 6 and 8 weeks. I don't get a scan until 12 weeks, so I don't have a solid due date. Is this normal?! Or do you think there could be a possibility of multiple foetuses?