Could it be twins again?

I currently have fraternal twin boys who are 5. I am now pregnant again and about 6 weeks. I have a doctor visit scheduled for next Thursday, but I just can't wait and need some input from someone who may have had a similar experience. I have been researching a lot, thinking that a second twin pregnancy is quite rare, but I found that 1 in 12 mothers of fraternal twins end up having another set of fraternal twins. Wow! When taking my home pregnancy test 3 days after the day I was due to get my period it immediately popped positive as soon as the pee hit it. My breasts seem to be growing much faster than my first pregnancy and are sore, but maybe this is just because my body knows how to get ready faster since it's my second pregnancy. All you moms out there who have had more than one set of twins please give me your input. Thanks!