Need to put my nerves to ease.

I just need to put my nerves at ease. On November 29th my boyfriend fingered me after he touched his dick they may have a had a little precum on it. But it had been around 10 minutes after. I've been having really bad cramps and nerves(from the fear im pregnant), I feel like I can start but it just hasn't came yet it supposed to start tomorrow. I just need my nerves  to be put to rest. Thanks:) can someone it's help me.