According to your symptoms, it looks like you are going into labor. Pressure on the lower abdomen and pelvis is due to the descent of the baby. Increased discharge is due to the priming of the cervix
for delivery. False labor pains can occur at this stage and they usually go away after bowel and bladder evacuation. If the tightening continues and increases in frequency associated with pain into the thighs and back, you should see your doctor immediately for further management. Good luck.