Ahh, the first few weeks of pregnancy—the nausea, beginning weight gain, and fatigue, not to mention the uptake in hormones. But those are just the side effects to the most important question: When do ...

Some infants are born before 24 weeks gestation and do survive ... progesterone can lower the rate of preterm birth by as much as 30–50 percent. Progesterone is a steroid hormone. Pregnant women ...