I would pee on a stick. You should have bled. Even if you conceived you should have bled. How long after sex did you take it? The cycle I got my bfp I had sex, ovulated the next morning, and took the pull nearing 2 days later. I still bleed so I didn't think much of it until morning sickness kicked in. How long ago was the unprotected sex? Sorry trying to figure out if a test would even be accurate right now.
I did see your post about early preg symptoms. Every time I took plan b or got off bcp or started bcp I always swear i am pregnant. It's most likely just your body adjusting to the hormones. But only a test can tell you definitively.
Also keep in mind if you did truly ovulate when you think you did you only have 24 hours (really more like 12) before the egg starts deteriorating and can't be fertilized. Conception on day of O is only 5%.
In any case, I hope you get the outcome you eant