Not needed. You'll end up worrying more. I am also pregnant, just over 12 weeks after 5 years of trying.
Where you can, you need to try to be calm. I know that's easier said than done, but you can't spend the next 30+ weeks worrying.
Make sure you're eating well, drinking lots of water, sleeping and getting plenty of fresh air.
I downloaded pregnancy meditation to listen to.
Try to get yourself in a positive and healthy mindset now so that you can start to relax a little bit and enjoy your pregnancy. The tests will eventually not be accurate and then you'll think you're not pregnant.
If you need something to focus on now, as I know your nhs scan is weeks and weeks away, maybe book yourself a private scan at around seven weeks. I had one, cost around £50 and I was able to see the heart beat clearly. It keep me going until the 12 weeks scan. It's only a snapshot of that exact moment but it gave me the peace of mind to keep going until my 12 weeks scan yesterday.
You will not do your mental health any good being scared for 12 weeks, even though it's very scary I know xx