It could, very possibly, be that you're pregnant.
Yes, you need to take a pregnancy test, and you need to stop gambling with pregnancy if you are not prepared and ready to deal with a pregnancy. I think you've been around here long enough to know that pre-ejaculate is present whenever there's an erection, and that it can indeed make you pregnant.
It's time to take that test, and let us know how it goes.
And please see these: Ready or Not? –The Readiness Checklist and this: Margaret Sanger’s Disneyland - An easy chart of your birth control options.
We are here for you, but we can only do so much, and the rest is up to you.
"Maypole/The ties that bind you will unwind/To free me one day/And everything decays..." - XTC, "The Wheel and the Maypole"