Uy, please go to your OB or hospital right away if your tummy is hurting, mas safe na ma-check agad, okay? Belly pain in pregnancy can mean different things, at kailangan talaga ng doctor to check properly. About evening primrose oil, honestly, I haven't tried it myself, and it's really something you need to discuss with your OB first bago mo i-take during pregnancy. Kasi may meds and supplements na not safe while carrying, so better safe than sorry na tanungin mo sila directly. I have a few mum friends din na always nag-aask sa doctor nila bago kahit anong bago na binilin for pregnancy, that's the way to go talaga! Take care of yourself!