Should I test?

So last week I was spotting on an off all week. Never like a full on period. Well I took a test the first day and it said negative. I was super nauseous all week and I've never been nauseous when my periods came. And I know that wasn't a period. I've got PCOS and have been on Metformin for 4 months. I've stopped spotting now and I'm not feeling nauseous or having mild cramps anymore. Should I take a test now? Was it maybe to soon to tell?