Why have my become dark?

My have become much darker and more pronounced. I had my period..but it was very odd. The period was heavy but then it was overtaken by this weird clear liquid discharge instead of finishing the period. I have unprotected with my long term boyfriend...I feel bloaty ish...for what reasons could this all happen? are there any other reasons than pregnancy for to become dark? Well my guy said that he doesn't pre...and he pulled out he didn't into me or anything. But yeah still worried. I'm not looking for ridicule I'm looking for real answers and advice. If you don't have any of those then don't bother answering. Mistakes happen. When your in love your emotions fly.