Hi mama! Yes, possible yan, most doctors can give you a good guess around 18-20 weeks, kaya perfect timing mo talaga with your check-up tomorrow! Just let your OB know you want to know the baby's gender if possible, though sometimes baby position pa lang ang hadlang kaya don't worry if hindi pa clear, maraming chances pa for follow-ups. A few of my mum friends got their gender reveal around that time din, so definitely worth asking your doctor!