I have a very...colourful obstetric history. I won't give the whole sorry story, but of 10 pregnancies, I have had 4 live births, one stillbirth and the rest were miscarriages.
I learnt a very valuable lesson which has served me well for other stressful times in my life- you must behave as if you know for sure that everything is going to be fine. Do whatever you can to reduce your general risk (once you have talked that thing through with your midwife), but apart from that you need to force yourself to believe that it will work out for you.
If the worst happens, it is very unlikely that you will feel better for having seen it coming. After my stillbirth, I got pregnant again fairly quickly. By then, I know that I had a 50% chance of miscarriage (chromosomal issue), so I decided to enjoy every last minute of the pregnancy. I really made sure I experienced all of it, rather than wasting the time in worrying about it. I did miscarry, and it was a great comfort to me, knowing that I had appreciated the short time that baby and I had together.
The chances are that your baby will be fine OP. But either way, you need to try to force yourself to think positively. This kind of stress will break you if you don't get a handle on it now, and may get worse once you have a baby to worry about. I think it would be a good idea to get medical support for your anxiety if it doesn't improve really quickly. This doesn't need to be your entire experience of pregnancy. As others have said, step away from the tests, and put that thermometer away.