Just making sure?

I had sex with my boyfriend for the first time today and we did anal but didn’t use protection, a couple times he accidentally slipped into my vagina but quickly pulled out and went back in to my butt, I’m worried that I could get pregnant but he didn’t cum inside me? He had came earlier and might have had a bit of precum on him but I’m not sure. Is there a possibility that I could be pregnant or am I worrying too much?