I took two positive pregnancy tests this week then a negative @ family planing then a positive then a negative blood at er then 15 positives today. am i pregnant?

See an OB-Gyn: Would see an ob-gyn let he or she do the test , get a history, examine you and give you an answer.

18 positive, 2 neg: You haven't mentioned how long ago you've missed menstrual periods, but you're certainly buying a lot of pregnancy tests. So far your ratio is 18 positive: 2 negative. Sounds like it's time to see your physician for personal exam -- maybe that will resolve the issue, or provide the steps needed to do that.