Oh dear, pregnancy, colds and hypos sound like a grim combo. Normally colds put your blood sugar up, as does pregnancy, so is it possible that you put your insulin up too much because of the cold and have got out of balance? Also, if you have a lot of hypos then your liver glycogen stores can get depleted?
Could you get an alarm for your libre so you get woken at 4.5 rather than waking yourself at 2.3 (though be aware the libre is particularly prone to under read at night and during hypos, so I wouldn't trust the exact figure without a blood test)? I believe that the miao miao is popular though as I'm no longer a libre user (allergic to the sensors) I'm not the right person to comment on this.
Good luck, I really feel for you on the hypos. I partially lost hypo awareness and had some horrendous hospital inducing hypos during both my pregnancies and ended up being babysat by friends when I was alone with my toddler during my second one. I would have killed (not quite literally) for a cgm, but this was more than two decades ago and a long time pre cgm.