Examining outcomes beyond 20 weeks gestational age in pregnancies conceived by ART compared to spontaneously conceived pregnancies 1. To determine if a difference in outcomes for pregnancies beyond 20 weeks gestational age exists between ART-treated and spontaneous conception populations in BC. Specifically, the investigators will examine the prevalence for gestational diabetes, gestational hypertension, premature deliveries, low birth weight, miscarriages, maternal length of stay in hospital, NICU admissions, APGAR scores\<6, and arterial cord gas pH\<7. 2. To examine the trend of outcomes beyond 20 weeks GA associated with ART by calendar year from March 2008 to April 2018. The research literature from other study populations suggest the prevalence of pregnancy complications are higher amongst women with ART-treated deliveries. Specifically, there is a trend towards higher rates of gestational diabetes, pregnancy induced hypertension, premature deliveries, low birthweight deliveries, perinatal deaths and maternal length of stay in hospital after delivery. The challenge lies in determining the degree of difference and the trend. Given the relatively older age of conception in BC, the investigators hypothesize that the aforementioned complications may in fact be higher in both the spontaneous conception and ART-treated groups. That being said, the investigators suspect the ART group is likely to still have a higher rates of gestational diabetes, hypertension, premature deliveries, low birthweight, and miscarriages.
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Pregnancy complications beyond 20 weeks gestation age
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
Pre-eclampsia
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
Gestational hypertension
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
HELPP syndrome
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
Low birth weight of infant
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
small for gestational age
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
Gestational diabetes
Timeframe: This outcome is measured from point at which patient is 20 weeks gestational age to one month postpartum
Low APGAR score
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum, depends on delivery timing
Cord arterial pH< 7
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
NICU admission
Timeframe: From point at which patient is 20 weeks gestational age to one month postpartum
perinatal death
Timeframe: From point at which patient is 20 weeks gestational age to 7 days post-delivery