Anxiety at four weeks

We just found out I’m pregnant at 3 weeks and 3 days, fast forward to now 4 weeks- I have been constantly worried about losing this baby. So far pregnancy has not been enjoyable because that’s all I can think about. I look at the tp every time I go to the bathroom to check for blood and I drive myself crazy over it. Any ideas on how to lessen this worry or any reassuring stats on it? I’m four weeks with baby #1, 24 years old and have always been healthy. Anything would be greatly appreciated!!