temp drop = AF?

Katrina • 30, 11 cycles to get my BFP, due Feb 2017.
does a temp drop of this much mean anything? AF due 8/10. some light spotting on CD31-33  (today). (light like only lightly pink 1/3 of the times I wipe. literally 1 dot on a panty liner each day - but not even today) tons of BFNs. (I got the wondfos on CD 22 that's why I took both tests together - just trying them out, also wasn't paying attention to the temp rise so I thought I ovulated a week earlier.) I have had mild cramps literally all month. going a little crazy. 
took a frer on 8/11 ( 11 DPO ) and nothing, not even a hint of a line. 
so TLDR: does your temp drop before your period comes or could that just be an outlier? I haven't even charted an entire month, yet. 
(I had a mirena until June so my cycles were like clockwork. July was 26 days. August is..not but I have no idea what my new normal is going to be.)