This is the period from the time of fertilisation until the formation of the trilaminar disc (i.e. weeks 0-3).
We will consider each week in turn
- Week 1: Ovulation to implantation
- Week 2: Placenta and bilaminar disc formation
- Week 3: Gastrulation
This is the period from the time of fertilisation until the formation of the trilaminar disc (i.e. weeks 0-3).
We will consider each week in turn