Should I be scared??

Me and my boyfriend had sex a few days ago and we didn't have a condom so he pulled out. My concern is that when he did pull out he came pretty quickly after. He swears he didn't cum inside me but that doesn't really do much for me even tho he would never lie about something like that. It was a spur of the moment thing and I wish he always carried condoms with him. Could I be pregnant?