KKH Appointment

Im 14 weeks going to 15 weeks soon. But i've yet to receive the date for the next appointment. My last appt was on week 11 which on that day they said they're gonna send sms but so far no news. Anyone facing the same thing? Shuld i call them to set a date or wait for them to send sms? I didnt opt for the down syndrome test so could it be they forget? Or they would schedule the next visit at later week? 😐