Worried

Is it normal to feel worried about the possible things that could go wrong? I've taken 4 test, First Response, from two different boxes, all were positive. I'm 2 days late, and my body is like clock work, and I'm never late. Took a test mid day today, and it was more faint than my first 4 test. I have drank a lot of water so far today, so I don't know if that effects it. Please someone ease my mind! 😣