What are the odds I could be having twins if I got a positive pregnancy test at only 6dpo?

Twins do NOT run in my family. Got a positive at 6dpo (according to opks) and it wasn't a faint positive.... it was bright. I should be approx 4wks 2days today. Don't go to the Dr until Nov 3rd. I've gained 6pounds already And I'm extremely bloated. I already have 2 kids and know you show sooner but this bloat is crazy. I've been way more tired than any other pregnancy and ever time anyone touches or bumps my breasts I wanna cry they hurt so bad. No nausea or anything just super sore breasts, extremely tired, constant hunger and extreme bloat. So what are the chances I'm having more than one baby this time like my husband seems to think I am?