Could I Be?

The last time I had unprotected sex (he did NOT ejaculate) was on day 23 of my cycle. My cycle is a bit irregular, due to my IUD, so my cycle tends to last 28-30 days. It's currently day 32, and I'm a bit skeptical. No plan B was used and no pregnancy test was taken. I've been having fluctuating changes in my discharge (chunky brown/clear pink). How possible is it for me to be pregnant?