My doctor put me and preterm labor medicine friday. Today I had intercourse at 12:30pm n I took my medicine at 2:00pm and at 4:00 pm I started having mild contractions and back pain an hour after that they got severe. I have to take my next pill at 8pm and didn't know if I should wait til I take my pill at 8 and see if it gets better or go to er. Or if the intercourse caused it.