I Switched From A Combination Birth Control Pill To The

I switched from a combination birth control pill to the mini pill with progesterone only. I started taking my mini pill right after my last active pill from my combination pill. I got my world the next week but I have not gotten one for 6 weeks. I was on my other birth control for 5 years consistently. Is it normal that it is late or should I be concerned? I am sexually active