Uy, mama! First thing, please check with your OB about this before taking anything, ha? Better safe than sorry, especially ngayon ka na sa 35 weeks.
I haven't really heard ng maraming moms using alkaline capsules during pregnancy, to be honest. A few of us sa mommy group namin, yan ang concern, hindi alam if it's okay or how it might affect baby. Your doctor lang talaga ang best person to answer this one, kasi they know your pregnancy and what's safe for you and baby.
Go ahead and ask sa next visit, or if you need an answer sooner, maybe text or call the clinic na. Sending you healthy vibes!