Like the other ladies said spotting could just be your period coming up. Back pain is also a very common pms symptom. A lot of early pregnancy symptoms are the same or very similar to your pms symptoms. So only real way to know if your pregnant is to wait and see if you miss your period first. And then if you do miss your period take a test. Let us know what happens :)
So the spotting is nothing cause im having back pains as well...what can the back pains means?
Yes, if you did not take the morning after pill or anything, you could probably be pregnant. Wait until your missed period and go get a test.
Spotting can be many things, 2 weeks after unprotected sex, it could be implantation, an infection, a period coming, anything. If you don't get your period on your expected date, take a test, good luck!