Possibly pregnant...

My bf and I have been dating for 4 1/2 months now. We live together since I was kicked out of my parents. I'm now 15 days late for my period. I've been constipated the whole time and have been getting nausea spells every morning and every once in a while during the days, hungrier then normal, sleepier then normal, very mild cramps and I had spotted for one day before my period was supposed to start. I don't have money for a test but with these symptoms could I be?