the possible causes for your symptoms are,
-physiological edema: it can occur due to prolonged standing or usually at the end of the day, the reason is when uterus
press on the blood vessels it will lead to escape of fluid from capillaries etc.
or pathological edema due to hypertension
-raynuad's disease: it is a autoimmune disease
in it due to exposure to cold
the blood vessels become constricted when that relieves hyperemia
occurs and edema can develop,
-coagulation abnormalities due to some problem to baby inside,
anyhow as sometimes there could be serious underlying cause, you should not neglect and consult your doctor as early as possible.