Pregnant or AF?

Brittany

Hi guys! So I have had light cramping for about 3 days. My BBT rose and then dropped yesterday and was lower today. Starting last night I had some light pink spotting. Today I have had brown spotting on and off. I never have had spotting before my period before. Anyone experience this before and have any idea on whether this might be implantation cramps or just a start to AF? I don't want to test for a couple days because I know as soon as I test AF will come and I don't want to get my hopes up and waste a taste so looking for input first. Thanks!