TTC Mirena Removed

I had my Mirena removed May 29th and started my period on the 31st. I had a normal 4-5 day period. Since then I have tested for ovulation about 5 times sporadically and all have come back with faint lines but not dark enough to be a positive.

Approximately two weeks from the start of my period (when I thought I would be ovulating) we TTC everyday for five days and I began spotting pink and brown with lots of discharge. Now approximately five days later I am very nauseous and took a pregnancy test this morning which was negative.

For our first baby we got pregnant right away. Any recommendations? Is it possible it was implantation bleeding? Is it too early to get a positive pregnancy test?