Precum and fingers

Now, I realize how stupid this might sound, but I'm really afraid I might be pregnant and I'm getting more and more anxious. Here is my cycle for you to see:

On the seventh I was at my boyfriend's place and we started fooling around. I gave him a handjob but he didn't come. I'm pretty sure there was precum on his tip though. When I pointed it out, he rubbed the liquid between his fingers and told me I was right, but we didn't think too much of it at the moment. We kissed and cuddled for about ten minutes while watching a movie and then he fingered me.

I know how unrealistic this might sound, but could I have gotten pregnant by his precum? I kept quizzing him about it, but he says his hands were dry when he touched me and that he had wiped them on the blanket but I'm still scared shitless.

I'm pretty sure I ovulated yesterday and today I started to experience back pain, bloating and a frequent urge to pee. I'm so anxious I just don't understand if it's my brain playing tricks to me or if I might really be pregnant (which is not an option at the moment since I'm still in high school).

What are your thoughts? I read everywhere that it's really unlikely but I'm still worried...