Mommy, I understand your fear, maraming kami dito sa circle na nag-hesitate din at 20 weeks, but since your OB specifically recommended it and issued the med cert, that means sila na ang nag-assess na safe siya for your stage. Ang best thing to do talaga is trust your doctor's judgment kasi sila ang nakakita ng full picture ng health mo, at if may doubts ka pa, definitely ask your OB ulit about your specific concerns so you feel more confident. Lahat ng moms I know na nag-booster during pregnancy ay okay naman, at honestly mas nakakacalm of mind yung nakatanggap ng protection lalo na nagbababy ka na soon. You've got this, sis!