What are some symptoms of pregnancy?

Well, I'm young and well yeah, the guy didn't use a condom (I'm angry), he pulled out a good full 2 minutes before he came and plus he barely even penetrated. Also, it lasted for about 10 seconds. That was August 22nd. I got my period 2 weeks later, a day before it was due and it lasted for about a week. It started off light with no cramps, the first day and then became very heavy with severe cramps. I passed a lot of tissue clumps. Ever since then, I've got no symptoms except the occasionally sore nip nop and my next period comes about Oct. 3/4. Could I be pregnant even though all of that happened?