A method for collecting one or more blastocysts from human uterus, step vaginally indwelling device in the cervical canal of a patient; a fluid delivered to the uterus through the device, the fluid and therewith one or more of the blastocyst and the step applying a vacuum to the uterus to aspirate from the uterus include: to reduce the likelihood of and remaining residual embryos viable pregnancy in the uterus, one or after retrieving the plurality of blastocysts from the uterus, the method comprising the step of causing damage to one or more embryos remained in the uterus and / or uterus. Step causing breakage, stage induces mechanical damage to the uterus; the and ultrasonic or radio frequency; phase inducing heat damage to the uterus; the step of delivering a chemical agent into the uterus; the step of delivering a hormonal agent to the uterus of the step of inducing damage with energy, including one or more.