Four Weeks Pregnant

Embryo in the 4th week of pregnancy

Your baby has now found his or her home for the next 36 weeks, give or take a few. During week 4, your nice, little blastocyst becomes an embryo, nestling itself safely into the uterine wall. This process, called implantation, can cause some spotting (implantation bleeding) and is perfectly normal.

The hormones your body is producing, especially hCG, may be making you feel unwell. Human chorionic gonadotropin (hCG) serves a valuable function--to ensure your baby receives the nutrients and oxygen necessary for development. Unfortunately, hCG levels in early pregnancy can cause women to feel anxious, fatigued, moody, nauseous, and dizzy or faint. In addition to these changes, many women will find that their sense of smell has become a potent superpower. This sensory strength, combined with nausea, can create food cravings and aversions. All women experience pregnancy and its symptoms differently.