Oo mama, totally valid ang feeling mo, a good OB should listen and take your concerns seriously, hindi lang i-dismiss as "ngawit" lalo na sa early pregnancy! A few of us tried switching OBs mid-pregnancy dahil sa similar reasons, and honestly sobrang difference ng experience, so if hindi ka comfortable, go ahead and jump ship, yan ang 16 weeks perfect time pa. The side pain you're describing deserves proper checking kaya definitely bring it up ulit sa bagong OB mo, or kung gusto mo pa i-clarify, i-text or call mo yung current OB para peace of mind, and then proceed with your appointment on the 12th with a new doctor na makikinig talaga. Wishing you and baby all the best!