nothing has came and I still have the loower tummy twinges

My cycle (29) is regular but I started 4 days(Feb 15) early with brown blood and alittle red that last about 4hrs of spotting then later it turned bright red my normal period starts off heavy and red not light and brown, which didn't smell or look at all like period blood and the cramps nothing near my actual ones and my back was bugging me mostly the right side, light flow lasted 1.5 days and turned back to spotting and faded in color until it was brown now that it is the day my cycle begins its little brown spots when I wipe. My back still alittle achy and my lower abdominal is stilll twinging. Gained 6lbs w/in 2 wks I'm 3 days into my suppose to be cycle and no more blood or brown I was suppose to start bleeding on Feb 19 or 20 but nothing has came and I still have the loower tummy twinges with the back bugging me only sometimes nothing sharp just dull lower back aches on the right side. should I take a pregnancy test or was it a weird early period? I don't ever start early or late.