Can I be pregnant or am I just crazy?

So yesterday was supposed to be the day I get my period according to my chart and I though I had gotten my period but it ended up just being spotting. It stopped about an hour later and this morning there was a tiny one in spot of blood on my pad. Now there is minimal blood when I wipe, and a brown discharge. I have tender breasts, headaches, fatigue, nausea, cramps, frequent trips to the restroom and this constipated feeling. I haven't tried a pregnancy test yet die to people saying to wait s little longer. What should I do?