Is there a chance I could be pregnant?

Hello! So about a week or two ago I started randomly spotting, it wasn't heavy like my normal period and it was a brownish pink color. It lasted for about 5 days. I wasn't sure if that would be considered my period. I was supposed to start on the 21st and I had the weird spotting 14 days before my period was supposed to start. For weeks now, I've been nauseous all day every day, super tired, getting headaches and getting dizzy, etc. I tested when I had that weird spotting and it came out negative but I'm still feeling really crummy and I'm not sure what to expect.