Just a little nervous?

Okay sooo, both my boyfriend and I are new to these things but we're usually super careful. But I mean, I'm a girl, and I get nervous about the littlest things. 
Basically, I gave him head and all that got in my mouth was pre-cum, and then we kissed a little after. A few minutes later he licked his fingers to finger me and so now I'm here, because I was on my 2nd to last day of ovulation and I know pre-cum can't get you pregnant most of the time but I'm still a little scared? Should I be?