I usually have a 33 day cycle and ovulate on average based on past 11 months on cd 18. I'm now on cd 26 and barely any line on opk which is unusual. I had a line a tad lighter than the control line in the morning cd 16 but four hours later nothing. My period is supposed to be due in four days. Do I take a pregnancy test if my period doesn't show up or do I keep testing with opks? This is my first month using them.