Brown discharge and unsure of bbt chart

K

I had light brown discharge with small specks of blood in it today. Two days away from period but spotting like this before my period has never ever happened to me before. It happened this morning and now it’s night time and it’s gone away. No AF yet. I’be been having cramping like I’m about to have my period for a couple days now. I can’t really understand why my literal phase keeps going up and down so drastically. I’m not getting up from bed before I take my temperature (p.s. my chart is kinda wonky I’m still getting the hang of how to chart it. I keep forgetting some days and at the beginning of the month I was using a regular thermometer instead of bbt thermometer. Oops!) does this look promising to any of you that know a lot about bbt charts or does it look like another disappointing month?