At 15 weeks pregnant, you are starting to feel more pregnant. You’ve probably gained about 5 pounds by now (a little more or less is fine, too) and are well into the swing of your pregnancy, but you may still be surprised by an unexpected symptom now and then. Some women start experiencing some unexpected side effects well into their pregnancy. For example, excessive salivation is not uncommon during pregnancy. This is nothing to be alarmed about, though it can be a bit inconvenient at times.