Final answer:
The blastocyst usually implants within the uterus, not outside of it. However, in rare cases of ectopic pregnancy, the blastocyst can implant in the fallopian tube, resulting in a tubal pregnancy.
Step-by-step explanation:
The blastocyst usually implants within the uterus, not outside of it. However, in rare cases, the blastocyst can implant outside of the uterus, resulting in an ectopic pregnancy. The most common site for ectopic implantation is the fallopian tube, where the blastocyst can attach and begin to grow. This is known as a tubal pregnancy.
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