A woman at 11 weeks gestation presents with heavy vaginal bleeding and severe lower abdominal pain. On examination, the internal cervical os is dilated and cervical effacement is present. Which diagnosis is most appropriate?

Match Column - I with Column - II and select the correct code: Column - I (a) Complete Parthenogenesis (b) Arrhenotoky (c) Thelytoky (d) Incomplete Parthenogenesis Column - II (i) Haploid male parthenotes (ii) Exclusively female; males rare/absent (iii) Cyclic parthenogenesis (iv) Diploid female parthenotes

Teratogens primarily exert their most disruptive effects on the developing embryo during which period?