Yes dizziness is one of the symptoms and signs of pregnancy in a woman.
Other signs and symptoms of pregnancy are headaches, nausea, vomiting, backache and lightheadedness,
mood swings, cravings for food, slight bleeding, cramping, spotting, constipation and tender or swollen breasts.
The dizziness during pregnancy is caused by hormonal changes.
Some women notice these pregnancy symptoms as early as 3 weeks but some don't feel the pregnancy symptoms until 4 weeks into the pregnancy.