RelaxinPregnancyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicPregnancy Trimester, FirstPregnancy RatePregnancy Trimester, ThirdReceptors, PeptidePregnancy TestsPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy, MultiplePregnancy in DiabeticsPregnancy, TubalPregnancy Trimester, SecondPregnancy Complications, NeoplasticPregnancy in AdolescencePubic SymphysisPregnancy Complications, InfectiousPregnancy ProteinsUterusAbortion, SpontaneousGestational AgePlacentaPregnancy, UnplannedPregnancy, High-RiskPregnancy, UnwantedReceptors, G-Protein-CoupledPregnancy MaintenancePregnancy Complications, HematologicProgesteronePregnancy, ProlongedInfant, NewbornPre-EclampsiaPregnancy, TwinCorpus LuteumEmbryo ImplantationFetal DeathLabor, ObstetricAbortion, InducedFertilization in VitroPregnancy, AbdominalPregnancy Complications, ParasiticEmbryo TransferDeciduaUltrasonography, PrenatalChorionic GonadotropinPrenatal CareFibrocartilageMaternal-Fetal ExchangeMyometriumLactationEndometriumParityPrenatal Exposure Delayed EffectsBirth WeightCesarean SectionCervix UteriPregnancy Reduction, MultifetalExtraembryonic MembranesUterine ContractionMaternal AgeSwineHypertension, Pregnancy-InducedFetusFetal Growth RetardationEstradiol