Stupid question...

I had worse than normal pms symptoms (bloating, mood swing, emotional, mild cramping, nausea) all of last week so I assumed it was just a bad month for me. Today all of my symptoms are gone, totally normal day. Again not normal, usually my symptoms last the first day or two of af.  I'm two days past af (I know don't jump the gun) but I took a test and got a bfn. Could it be a false negative or more likely a late af? Are pregnancy symptoms THAT similar to pms?