Disclaimer: I'm not an expert! But my opinion from my own experiences and what I've read are this:
I presume you're exclusively breastfeeding? You'll probably be aware that for the majority of women, if you exclusively breastfeed (particularly if co-sleeping and not using pacifiers), it's a natural form of contraception up until around 24 weeks PP. As solids are usually introduced at that point and milk feeds dropped, ovulation can return (followed by AF if you don't catch the egg of course!).
It's not uncommon for the first cycle PP to be annovulatory whilst your body gets back into the swing of things.
And... there are exceptions to the rule! (I'm one, first PP af just shy of 4 months despite meeting all the requirements to use breastfeeding as contraception!)
The comforting thing for you is that your temps are in your pre ov range... but, y'know how it is with our bodies - they're capable of amazing things and catch us by surprise just because they can!
I guess what I'm saying is it's unlikely you're pregnant, but until you test (or wait a while, then test) your mind probably won't be set at rest. COntinue temping if it's not too much of a hassle with your LO as you may be able to catch your thermal shift (presuming it hasn't happened

) and can expect your first PP af instead of her turning up unannounced!