OPK help!!!

Nicole

so I started using AccuMed ovulating strips. I started last Thursday and the Friday it was a little darker but still negative. now I was in Nashville this weekend so it was really difficult to test at the same time as I was out and about all the time and not near a bathroom. Anyways the darkest test I had was Friday and they've all been lighter in colour since then but all negative. should I be worried? or is my cycle just all over the place still