So confused..please help

My lmp was dec 9th-12th...everything was normal blah blah. I then spotted (very lightly-like once a day) on the 24th and 25th. My cycle is usually 31-32 days long took tests the 31st and.(jan)14th both were negative. I've had sore boobs and lower back cramping for about a week now..I literally have no idea what is going on ith me. Ive also been pretty moody. Any help or insight is very much appreciated. Thank you!