I say stick it out for the rest of the cycle. Often time temps are erratic when AF is here but then they start to make more sense. Is there a time you can consistantly take your temp. Since you work the night shift, take the temp right when you wake up (even if it's in the afternoon) - it's best to temp after 3-4 hours consistant sleep. That's why you have so many open circles because you took your temp at 2 different times. May I also recommend temping vaginally next cycle... my temps were all over the place until I switched. Hope this helps! Don't give up on charting just yet.