Period

So my period has been irregular for the past 3 months and I think it’s cause I took plan b right after sex and like a week after I took option 2 right after sex but I was on birth control I just worry about the birth control not working so I took emergency contraceptive pills I got a 3 day period like a week after I took the option 2 pill then after that I had a 42 day cycle till my next period now I’m on the 43 day and I’m 9 days late. My insurance switched so I started back up on my birth control like 2 weeks ago could that be causing my period to be late