opinions

I had started what I thought was my period on 12/29, it was a lot lighter than usual and to my surprise by Friday it was pretty much gone. Saturday I had little spotting but nothing like even a light period. Sunday I had brown spotting while wiping after going pee. Today and Monday nothing. I have never experienced this, and on 12/27 I took a test and it was definitely a BFN. My boobs have been itchy and I have not had the normal cramps like I always have with my periods ( which by the way are always normal and 5 days long) has anyone else had this then found out they were pregnant? Wondering if I should test again? Just wanna hear it from others if this has happened