implantation spotting?

So I have 25 day cycles, I ovulated on May 1st and have had a multitude of symptoms. Felt a distinct pinching/pulling sensation 10,11 and 12 dpo off and on. Took a test yesterday and it showed positive, but this morning I took another and it was negative. This afternoon I started having brown and pink spotting with no cramps on 14dpo. Anyone else have pinching and then have spotting that turned out to be pregnant? I'm really worried. Hoping it's not af coming. It doesn't make sense that I had those pinching pulling feelings off and on for those 3 days. just want some answers or insights..