Pretty much as the title says I'm 19 days late on my period, normally I'm pretty regular just off a couple days here and there. When I first started having my period and for a couple years after it was nothing for me to go a month without having one but it's since fixed itself. A couple of days before my period was due I had super light (didn't even need to use anything) spotting for like a day. Now I'm thinking it was maybe implantation bleeding? I can't remember the last time I had sex, but it was unprotected, my guy is fixed though. I took a test around when I was 4 days late that came back negative. I haven't really been anymore stressed then normal, I haven't changed any life style habits or anything. The only pregnancy symptoms I have are cramping in the lower abdominal area (feels like the cramps I get before I start), fatigue, and random spurts of nausea. What do you think is the cause? Could I be pregnant?