Uy mama, please contact your OB or go to the hospital agad if the contractions get stronger or more frequent, better safe than sorry at 35 weeks, especially with a first baby.
Alam ko scary yan, and a few of us mums have had similar experiences, ang tightening ng tyan can be Braxton-Hicks or preterm contractions, but kaya lang important that your doctor is monitoring you closely. Glad your baby checked out okay and your OB already gave you something to help! Just rest as much as you can, drink lots of water, and follow your doc's instructions talaga. Tawagan agad si OB if anything changes, ha? You've got this, almost there na.