Is it possible po na mag carry ng twins kahit na very small belly pa at 15 weeks and 5 days?

Im just excited lng kasi to know if single or twins tong pinagbubuntis kaso ang liit ng baby bump ko , 15weeks and 5days pa akong preggy. Di pa rin ako nakakapag ultrasound kasi wala pang budget. Pero nung nag PT ako nag positive ako 2weeks before ng menstruation date ko