Thanks Guppy.
No the BBT thermeter is new, and I've checked it again this afternoon and it says 36.6 so it's def working. I woke up at like 4 in the morning and did my temp then to see what it would be and it was 36.6, then when I woke up at usual time I did it and it was 36.3. It's so confusing. The only reason I did it was because I woke up at 4 sweating like a madwoman and thought i'd check and temp was 36.6, then I kicked duvet off and woke up much cooler at usual time and temp was lower. Does duvet make any difference though? haha.
I put 36.3 in because thats the one I did at 6.30 which is when I always wake up and test.
Haven't really had any twinges or anything today... not like yesterday so I reckon it was yesterday, but once again i'm going to be wondering for next two week what DPO I am! I'll do temps again in the morning and see if there's any rise. I'm on CD19 now and we DTD on CD18 and gonna do it tonight just in case, so hopefully will be covered either way!