Hay, I haven't personally tried Heragest insert kaya hindi ako makakapayo dito, pero alam ko maraming moms na nag-insert for preterm labor risk at swear by it talaga, ask your OB din kung ito talaga ang best option for your case kasi bawat pregnancy is different. Samahan mo lang ng proper bedrest at hydration, at fingers crossed everything goes smoothly pa lang! Take care of yourself, mama, 34 weeks na kayo, kaya na!