Negative opks so far

Can you start showing signs of ovulation getting close but negative opks? I’m not in my fertile window yet (off by a day or 2) and I’ve been slowly starting to show signs, TMI* my cm is starting to change to sticky and mild cramping but my digital opk is negative. How fast can you usually see a change? I’m also somewhat paranoid that I won’t ovulate and not know it so I’m trying to push it out of my mind. Should I just keep testing and BD anyway?