Worried I'm looking for symptoms

So we have been ttc since the beginning of the summer, my cycles are really irregular (since July I had a 52 day cycle, a 38 day cycle and I'm on day 46 now) 
I think I ovulated Halloween weekend and we dtd the 27 & 30, since last week I've had this annoying nauseous feeling in my throat and lower back pain...no signs of AF, but I do keep having to run to the bathroom, both to check my cm and pee! 
Took two tests last Sunday and Weds, both BFN but I think I took them too early...thoughts? 

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