PLEASE HELP! 16 Y/O

i have an irregular period. it has been 66 days since my last period. my boyfriend of six months and I have sex on the reg. sometimes we use protection, sometimes we don’t. i’m not on any form of birth control. we took a pregnancy test (clearblue digital) yesterday and it came back as “not pregnant.” my period is still a mystery. should we test again? if so, when and what kind of test? has anyone every had trouble with the ClearBlue Digital? has anyone ever had this (such a long time between periods) happen to them?

*my cycle length is anywhere from 30-45 days but my current cycle is 66 days and counting.

⭕️UPDATE: my period is 60 days late. it has is been 97 days and counting since my last period. i’ve gotten 4 negative at home pregnancy tests.