Hi mama! Congrats sa pregnancy! So typically CAS (Comprehensive Anatomy Scan) ay around 18-20 weeks talaga, at based sa schedule mo, your May 15 ultrasound might be perfect timing since you'll be around 20 weeks na by then, but best to confirm with your birthing clinic if that pelvic ultrasound is the CAS na or separate pa talaga, kasi sometimes the pelvic screening and anatomy scan ay pwedeng gawin together depending sa clinic setup. A few of us mums namin, nag-clarify lang kami right away sa OB para alam namin ano exactly ang scan, huwag mag-assume lang talaga! Just shoot them a quick message or call para sure, mama, para prepared ka na rin emotionally para makita ang baby details.