Virginity

So I just lost my virginity a couple days ago to a guy I’ve gotten pretty close to over about 6 months. It wasn’t planned and it kind of just happened but I can’t help feeling a little guilty. First time was the back of his car and then second time was 2 days after at his house. He’s 3 years older than me and has much more experience and it’s not that I don’t trust him like I do I just don’t want to have to have sex every time I see him now. I feel really guilty because we didn’t use protection and I didn’t even think about it while it was happening. He told me he had been std tested recently and he did pull out but idk I feel weird about it. Any advice?