Need Charting help!!!!

Hello!

So I have been charting for 3 cycles since being told I have pcos and am now trying acupuncture which has dropped my cycles to 29 days. However, my last two cycles albeit a little long were still consistently patterned (ie. Low temperature until o and then increase etc.). This time it's says I o'd on day 15 and jumped up as per normal but now from dpo4 it has been zig zaging majorly!!! Like temps ranging from 36.4 to 36.9 on a day to day basis!!! Anyone had this before???? So confusing!! Is it a pregnancy sign or just that my system is crazy? Could the cold mornings have anything to do with it? Any advice or experience greatly accepted!

Xxx