Thoughts?!

My husband and I have been TTC our first baby!! We've been trying since June. My periods have never been regular... I haven't had a period in a couple of months, I've taken 2 pregnancy tests recently, both quickly responding negative. My boobs have been super sore lately, a symptom I've never had, not even when getting ready to start my period. I've been very emotional the past week or so. Today however I have been very crampy, however no sign of a period yet. Any thoughts?!