I think I'm pregnant?

soooo, my cd is 39, but I have very irregular periods since I got my Skyla iud removed about 9 months ago. I was pretty sure I wouldn't be able to get pregnant after it was removed due to a lot of complications I had when it was still inserted. But Im technically about 3 days late now.. which isnt really abnormal except I took an opk test for hell of it, and it came up with a fairly strong positive. I havent had the chance to hit the store yet to purchase an hpt, but what do yall think the possibilities of me being pregnant truly are? Any insights would be helpful.