Help please. am I pregnant?

Karen
Hello all !! I had my last periods on 14th December. Since then I haven't had my periods. Me and my boyfriend had unprotected sex on 23rd and then I took plan b. After that we again had sex protected but the condom broke and I took second plan on 02/02. In between my doctors started me on progesterone to kick start my periods after confirming with blood test that I am not pregnant. I started progesterone on 02/06 and after 10 days course my periods still didn't start.  I have done multiple hpt including the Latest one on 03/17 and they all came out negative. Are there still chances that I might be pregnant?
Please let me know. I would really appreciate your help. I don't want to get second blood test if it's not of any help.