Might be a miscarriage?

Hi everyone. I found out I was pregnant a few days ago and have been experiencing a range of emotions from overjoyed to terrified. I’m 5 weeks pregnant and have been feeling really good. My husband and I have been trying for quite awhile. (I’m 38 and he’s almost 40). Anyways, I woke up a few minutes ago and went to the bathroom to find pink/light red blood on the toilet paper. I’m freaking out. Is this a miscarriage? How do you know the difference between miscarriage and spotting which is apparently normal? I’m really scared.