Taking Out Birth Control

Ana • Officially PREGNANT With #3!
I took out my Mirena 4/15/15 aa of today 5/12/15 I have yet to get my period. I have had unprotected sex 4/26, 4/30, 5/5, 5/7, 5/9. What are the chances that I am pregnant? When should I try to take a test. I took one 5/10 and was negative. Don't know if anyone has experienced this. Please let me know! Thanks!