Thoughts?

So here is our calendar. A little info with it. 10/6 was our anniversary so we went away for the weekend. We had a very good weekend, relaxed and intimate in a cabin in the woods. When we got back Monday I took an opk and it was positive. Well fast forward a week, two days ago I had some slight cramping and since I have been getting more and more nauseated with each day. Today I have a metallic taste in my mouth as well. I took a test and it was negative. Could it still be too early to test? I know I had a positive opk 10/7 but it logged it as the Wednesday after.