attention twin moms

Tonya
Help! I'm 7 weeks pregnant and I just have a huge feeling I'm having twins. I've been slightly nauseous getting worse every day since six weeks and I got a positive super early . 2 days before my period was supposed to start. What do you guys think? Did you know you were having twins before the ultrasound? Did you get a positive test really quickly?
Side note: twins run in my family my grandmother has three sets of fraternal twin boys she hyper ovulates so I think I may have that hyperovulstion gene. But idk