Right so I have been charting my bbt for a while now and I decided this month out of curiosity the week I'm due to ovulate that I would do a paper chart so I could see what goes on. on the 25th I got a positive opk so we bd'd 25/26/27 and well looking at my chart I don't think this agrees with what the opk says :/ btw ignore the random spike I was ill that day