Are the nerves normal?

So I let my boyfriend cum in me at the weekend. Not just once but three times (surprised us both!!) I have the copper coil. I have jitters about what if I'm pregnant. Always analysing my body lol, bit hypochondriac. I know it's 99.9% effective so I shouldn't worry. But he was my first with sex with pull out initially and then with cumming in me. Is it normal to feel a bit nervous?