I can't stop worrying... anyone else?

This is my first pregnancy and it's taken 9 months to concieve, due to irregular periods. I tested positive on Monday with a super faint test...

and I've taken 7 since. including this one today...

I just feel like I can't put my mind at ease and I'm worrying that something bad will happen or it'll just go away. Has anybody else felt like this and what put/helped put your mind at ease? I have period like cramps which i have read are normal but I don't think they are helping. Thanks xxx