Don't get ahead of yourself... implantation bleeding would have happened much sooner than 10 days after (within a week) this bleeding is probably just a side effect of the morning after pill. You have put a massive dose of artificial hormones in your body. A bit of random bleeding and your cycle being weird is completely normal. Its highly unlikely that you're pregnant. Obviouslt take a test in 5-7 days to put your mind at rest completely... but don't start worrying unneccesarily.