So confused.

My fiancé and I had unprotected sex on Jan. 22nd. I got symptoms of my period getting ready to start (cramps, sore nipples) I was supposed to start my period on the 26th but to this day I still haven't started. I took a test this morning but BFN. I'm so confused! Today I'm super crampy, especially on my right side. No other symptoms really. We are TTC and it is very hard, especially playing the waiting game. Trying to keep myself busy so I don't think about it to much!