hi there, frequent urination
is one of the common symptoms of 3rd trimester of pregnency and it does not indicate emminent labour, acid reflux
like wise can be explained by the polyhydramnios
which is pushing your stomach upwards. At 37 weeks you can visit your gynacologist for your cervical maturity and also get an ultrasound
done for fetal maturity and if possible then you can request an elective labour. Let your gynecologist give you the best option, take care.