Helpppp please 😔

I'm so confused. So I have really really irregular cycles and I started taking vitex a month ago. The past 3 or 4 days I've had on and off spotting. Never enough to show up on a pad but it's there when I wipe. I've been nauseous, headache, and light cramping. I just don't feel myself. I took a cheapie test 3 days ago and it was a BFN. Is there a chance I could be pregnant?