Hello Thanks for writing to us with your health concern. Spotting at 33 weeks can be accompanied by a risk of preterm labour . Betnesol contains betamethasone, which is a steroid injection given to reduce the risk of preterm labour. It enhances the lung maturity of the baby, as babies born before 37 weeks are completed have incompletely developed lungs, and they have difficulties in breathing as a result of that. Vitamin K contains essential clotting factors, as they are deficient in the newborn, and can lead to formation of clots in the brain and body systems. There are no major side effects of these injections on the baby. The benefits to the preterm baby far outweigh any possible risks. It is best to take these injections to fortify yourself against the risk of preterm labour. Also, avoid stress, intercourse and jerky travelling. It is best to take proper rest and take the medications as prescribed. All the best Please feel free to discuss further, by writing at - http://doctor.healthcaremagic.com/doctors/dr-aarti-abraham/64623 Take care