Can you get blood clots from having pernicious anemia?

Rarely. Pernicious anemia by itself does not cause blood clots, but some patients with pernicious anemia are at risk for developing cancer. Cancer definitely increases your risk of blood clots.
No. This anemia is not from blood loss, rather it is due to B12 or folate (folic acid) deficiency. Long term (decades) complications of pa include both gastric malignancy and carcinoid neoplasms.