He pulls out..?

I need some advice, I have been seeing this guy for about 9 months and recently we became sexually active. I went back on my birthcontol but then had to stop for a month then start a new one.
​My problem is we don't use condoms, he only pulls out. And sometime it feels so good that he maybe might cum a little bit inside me....
​Should I be scared that I'm going to get pragnent ?   
​Please help!