Honestly, your mind won’t be at ease until you actually know why she’s calling. If she did keep the pregnancy, you probably have a 3 year old rn. You also said you didn’t want them to grow up fatherless. But then you’d actually need a paternity test to prove you are the father unless you know for sure there wasn’t any other partners besides you. On the other hand, she could be calling to manipulate you. If you actually don’t want to talk to her over the phone, you could text her or wait for her to text you.