Has anyone of you experience the struggle in getting into the priority lane in MRT/LRT when pregnant? Will be travelling from Antipolo to Pasay and I'd like to commute via train so it would be faster.

The struggle is real in riding the MRT. It really needs some fixing and some more guide rules so the commute would be much easier and less frustrating for everyone. I think you're commute would be fine as long as you don't ride the MRT when it's rush hour.