( This ( ( ( is ( especially ( important ( during ( the ( first ( 14 weeks ) ) ) ) ) ) ) ( after ( ( your ( last ( menstrual period ) ) ) ( when ( ( fetal ( organ systems ) ) ( are forming ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (ADJP (RB especially) (JJ important) (PP (IN during) (NP (DT the) (JJ first) (CD 14) (NNS weeks)))) (PP (IN after) (NP (NP (PRP$ your) (JJ last) (JJ menstrual) (NN period)) (SBAR (WHADVP (WRB when)) (S (NP (JJ fetal) (NN organ) (NNS systems)) (VP (VBP are) (VP (VBG forming)))))))) (. .)))
This is especially important during the first 14 weeks after your last menstrual period when fetal organ systems are forming.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))