Super early Positive test

I was once in a group with women that were obsessed with getting pregnant and I picked up a lot of pointers from them. Mind you their obsession came from being infertile and things like that. Anyway a lot of women say that when you get a positive pregnancy test and the lines are darker earlier it's more likely that you have multiples I took the test and I was 3 weeks pregnant in the lines were super dark. Do any of you think that I might be carrying multiples?