Early Ovulation?? Metallic taste, back pains, and light spotting

Tg

So I’m freaking out! My fertile window was said to begin last Thursday through this past Monday. So according to this app I’m 5dp. Yesterday I found scanty literally just like 3 drips of blood in my panties and have been experiencing cramping. Last night while Out with friends I got the worst taste in my mouth of metal. It was soo bad that I asked my friend to take a sip of my water bottle to see if she tasted it to. She said nope and that I’m crazy. I’m thinking I could he pregnant but there’s no way I’m feeling these symptoms at 4 dpo. Could I have ovulated last Thursday? Which could have put me at 10 dpo?