( ( During ( the ( subsequent pregnancy ) ) ) ( , ( ( fetal blood ) ( ( was ( ( sampled ( 19 weeks ) ) ( after ( the ( last ( menstrual period ) ) ) ) ) ) ; ) ) ) )
(ROOT (S (PP (IN During) (NP (DT the) (JJ subsequent) (NN pregnancy))) (, ,) (NP (JJ fetal) (NN blood)) (VP (VBD was) (VP (VBN sampled) (NP (CD 19) (NNS weeks)) (PP (IN after) (NP (DT the) (JJ last) (JJ menstrual) (NN period))))) (: ;)))
During the subsequent pregnancy, fetal blood was sampled 19 weeks after the last menstrual period;
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))