Hindi ako personally nakapagtake ng TriHEMIC, pero since prescribed ng OB mo yan, I'd say follow her advice, she knows your specific situation best! Kung concerned ka pa rin, you can always ask your OB directly kung ano exactly ang nasa TriHEMIC or if there's anything in it you're worried about, kasi sometimes the multivitamin itself can actually help with iron absorption which some pregnant moms need. A few of my mum friends also had constipation issues during pregnancy and their doctors adjusted either the vitamin brand or added stool softeners, so definitely bring this up sa next check-up mo para ma-optimize ang solution for you. Don't hesitate to ask your OB kung may side effects na nakikita mo or if you want more clarity, that's what they're there for!