Confused.. can anyone relate?!

I need some advice/input/stories etc ...

My last period was November 28th - December 2nd. We weren't really trying this cycle but had unprotected sex December 17th, 25th, and 30th.

I am not too sure when I ovulated this month as I wasn't tracking and it doesn't help that my periods are irregular, however typically range from 33-45 days.

Anyways, I normally get sore heavy boobs a week before af arrives and neither have these things have come about.

I did notice brown spotting only when I wiped on January 5th and some pink tinged discharge January 6th.

Symptoms I have experienced include thick creamy white discharge, fatigue, sore nipples, gassy, cramping on and off (not painful), and I am a tad over sensitive. Is this all in my head?!

With my longest cycle being 45 days I figured I'd do a hpt if af didn't show by the 12th. So I took a pregnancy test on the 13th and it was a bfn.

Should I do another one tomorrow or wait a little longer?!