How long does it take for an embryo to implant in the uterus?
Human blastocysts should hatch from the shell and begin to implant 1-2 days after day 5 IVF blastocyst transfer. In a natural situation (not IVF), the blastocyst should hatch and implant at the same time - about 6 to 10 days after ovulation.
Implantation. Once the embryo reaches the blastocyst stage, approximately five to six days after fertilization, it hatches out of its zona pellucida and begins the process of implantation in the uterus. In nature, 50 percent of all fertilized eggs are lost before a woman's missed menses.
- This bleeding, if it occurs, can last from several hours to a couple days. Most of the time, implantation occurs about nine days after ovulation, but it can occur as early as seven days or as late as 12 days after ovulation.
- It may mean you're pregnant. A bit of cramping about eight to ten days after ovulation could actually be a sign that you're pregnant. These pains—known as implantation cramps—can happen when the newly fertilized egg burrows itself into the wall of your uterus.
- It's estimated that more than 50 percent of all fertilized eggs fail to develop. If it's going to survive, the egg has a lot of work to do. First, it orders the zona to lock out all other sperm. And then the egg must finish meiosis, expelling half of its chromosomes into this tiny pouch, called a "polar body."
The Sperm's Long Journey. A man may ejaculate 40 million to 150 million sperm, which start swimming upstream toward the fallopian tubes on their mission to fertilize an egg. Fast-swimming sperm can reach the egg in a half an hour, while others may take days. The sperm can live up to 48-72 hours.
- Implantation. Once the embryo reaches the blastocyst stage, approximately five to six days after fertilization, it hatches out of its zona pellucida and begins the process of implantation in the uterus. In nature, 50 percent of all fertilized eggs are lost before a woman's missed menses.
- sperm can live up to 5 days, not 3. a human egg is only viable for 12 to 24 hours, you can get pregnant anytime from about five days prior to ovulation to even occasionally two days after, for a total of about seven days.
- Pregnancy symptoms at 4 weeks. Normally you get your period about 4 weeks from the start of your last period, but if you're pregnant, the clearest sign at this point is a missed period. Many women still feel fine at 4 weeks, but others may notice sore breasts, fatigue, frequent urination, and nausea.
Updated: 17th October 2019