It is common for mild contraction of the uterus
to occur when there is stress, in the third trimester. If the tightening increases in frequency or intensity (five or more in an hour), it needs concern. Otherwise, if it subsides with rest, there is no need to worry. Tocolytics like Terbutaline
are usually given to prevent preterm labor
. I advice you to consult your obstetrician and decide. Meanwhile take rest, lie on your left in left lateral position and avoid stress. Wish you good health.