There’s more than one way to measure a pregnancy timeline. Many women are familiar with the three trimesters of pregnancy, but how long exactly does each trimester last?  And what’s happening during each of them?  This timeline will break the 40 weeks of pregnancy down and explain how your baby is developing.

Weeks 1 and 2
Congratulations, you’re pregnant! You may not know it yet, though. Many women do not learn that they are pregnant until they are four or five weeks along. Signs that you may be pregnant include missing your period, nausea, food aversions and cravings, frequent trips to the bathroom, excessive tiredness and breast tenderness. 

Week 3
Right now your baby is a group of cells, growing rapidly. You probably don’t know you’re pregnant yet, since you most likely haven’t missed your period.

Week 4
Your pregnancy still isn’t showing, as your baby is only 1mm long. You will likely miss your period at the end of this week, which may be the first tip-off that you’re pregnant. Right now the amniotic cavity, which will hold the amniotic fluid, is starting to form, as is the placenta. Layers of cells are developing that will eventually become the nervous system, the gastrointestinal tract, liver, pancreas, thyroid, skeleton, connective tissue, blood system, urogenital system and muscles.

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