Am I having a misscarriage vaginal bleeding, stabbing pains, lots of blood, just got off my period 16 days before this started. Had my tubes tied

The. The fact that you have had your tubes tied makes a miscarriage a lot less of a possibility. You are lexperiencing menorrhagia (painful, heavy period), causes include: hormonal imbalance anovulation uterine fibroids (benign tumors of the uterus0 polyps cancer medication effect (i.e. Anti-inflammatory medications) pregnancy complications (miscarriage or ectopic pregnancy) in addition to this list there are other causes. It would be wise to visit your primary care provider or gynecologist for work up and treatment if needed. Good luck.