I Had My Period 9/16. On 9/8 And 9/14 I

I had my period 9/16. On 9/8 and 9/14 I had unprotected sex. We used the pull out method both times. My period was regular last month and it is now 10/9 and my period is supposed to come on 10/13. I was wondering if I could be pregnant? I was pregnant earlier this year and had an abortion. I've felt nauseous 3 times since my period similar to the feeling I got when I was pregnant.