How do I find out whether I am a secretor or not? Without doing the test!

Hi!
I am new to this page. I just finished doing the Master-Cleanse and my chiropracter told me to check out this diet for blood types. I am O positive, never been ill, always healthy,no problems till I became anaemic and had a hysterectomy about one and a half years ago. Since then my metabolism has slowed down, I have put on 25 pounds in weight and I can´t shift it! I go to Aquagym everyday but with little effect! I enjoy eating but don´t pig out, I eat everything, what you would call a well balanced diet.But now the weight just piles on.
PLEASE HELP! I NEED ADVICE! Tweet