Uy, better call your OB right away or go to the hospital to get checked, hindi dapat guesswork ang ganitong bagay especially at 37 weeks na! Stomach pain and vomiting pwedeng maraming reasons, kaya kailangan talaga ng doctor to rule out anything serious.
A few of us mums na nag-experience ng similar stuff, iba-iba ang cause, sometimes labor signs, pero sometimes something else entirely na kailangan ng medical attention. Better safe than sorry, 'di ba? Keep us posted, mommy!