Could I be pregnant?

Hello, everyone! I am wondering if I could be pregnant. The first day of my last period was October 16th. I am now on CD 46. Still no sign of my period at all. I have taken 3 pregnancy tests, the last one was on Thursday, and all were negative. I don't really have any symptoms except fatigue, backache, and loss of appetite. October was my first month off of BC pills so that might be affecting my cycle?? I am just going crazy with this waiting game and was hoping you guys might have some insight. Thank you in advance!!!