So I used a first response test on wed (8/7) thought it was 3 days before my period and it was negative. I had very light pink stuff and a small amount only when I wiped twice wed and only once so far today with extreme dizziness and nausea. Could it be implantation bleeding and I used the test too soon because I do have irregular periods and think I may have ovulated later than app said. Thinking I ovulated closer to the 28th not the 26th would that make enough of a difference?