Fem Repro Timeline By facebooker_10218767745210124 Jan 1, 2018 Last Menstrual Period (1st day) Period: Jan 1, 2018 to Jan 7, 2018 Menstruation Period: Jan 1, 2018 to Apr 1, 2018 First Trimester (~ 13 wks) Period: Jan 8, 2018 to Jan 14, 2018 ~ Pregnancy Window ~ Jan 14, 2018 Ovulation {Ovary} Period: Jan 14, 2018 to Jan 28, 2018 Week 1 Jan 15, 2018 Fertilization (~ 24 hr) {Fallopian Tube} Period: Jan 15, 2018 to Jan 16, 2018 Zygote (1-2 d) {Fallopian Tube} Period: Jan 15, 2018 to Mar 12, 2018 Corpus Luteum -- hormone responsibility Period: Jan 16, 2018 to Jan 17, 2018 Morula (2-3d) {Fallopian Tube} Period: Jan 18, 2018 to Jan 23, 2018 Blastocyst (4-9 d) {Uterus} Period: Jan 21, 2018 to Mar 5, 2018 Implantation (start @ 7-8d) {Endometrium of Uterus} Period: Jan 22, 2018 to Apr 30, 2018 Placental development Period: Jan 23, 2018 to Mar 5, 2018 Embryo (9d- 9w) (notice l8 period w/in here) {Uterus} Period: Mar 5, 2018 to Oct 8, 2018 Fetus (9w - 9mo) {Uterus} Period: Mar 12, 2018 to Oct 8, 2018 Placenta -- hormone responsibility Period: Apr 2, 2018 to Jul 8, 2018 Second Trimester Period: Jul 9, 2018 to Oct 8, 2018 Third Trimester