Spotting

My periods have been pretty regular my whole life without any spotting. I've been on bc for about 4 years now and it continued to be the same. About a year ago the dr switched me to bc withouth estrogen because I had high blood pressure I was told irregular peirods and spotting would be normal with the switch. So far I've experienced both this is my second time spotting and it's been about 2 and half days. Is this normal??? Also sometimes my cycle is 41 days. Is this ever gonna stop? Because it gives me massive anxiety freak outs! Advice?!?