By the time the 3rd week of your pregnancy begins, fertilization might have already taken place. But as the sperm can stay in the fallopian tube for up to 6 days, there is also a possibility that it hasn’t. But if the baby is conceived, or in other words, the fertilization has occurred, the blastocyte will then start moving towards the uterine lining for implantation which would occur in the 4th week.
In terms of your menstrual cycle which generally lasts for 28 days, the 3rd week of pregnancy is the period between 14th and 21st day of the cycle as the first week of pregnancy is counted from the day when your menstrual cycle began. If you’ve read the previous 1st and 2nd-week pregnancy posts, you might know that ovulation occurs on the 14th day of the cycle and the period between the two days before the ovulation and until the ovulation day is considered the best phase to have unprotected sex if you want to get pregnant.
If you want to get pregnant and have had unprotected sex in this phase but have not started experiencing the symptoms or believe that you have not been pregnant yet, a couple days after ovulation are also ideal to have unprotected sex. And if you’ve started experiencing the symptoms already, you’d surely like to know what might happen in the 3rd week of pregnancy. So, let us begin-
Baby’s Development in the 3rd Week
Last week, a few eggs in your ovaries matured due to menstrual cycle hormones and one of the eggs moved to the fallopian tube to meet the sperm. In technical terms, it is only after fertilization occurs that a woman is officially pregnant. So, while this might already be the 3rd week of your pregnancy, in reality, this is just the 1st week when there is a blastocyte in you which will turn into a full-fledged baby in about 40 weeks.