Early pregnancy symptoms or should I be worried??

So I’m about 5 weeks pregnant. This is my second pregnancy. The first resulted in miscarriage. I know I shouldn’t worry too much but sometimes I can’t help it. My job requires a lot of cleaning so now I wear a mask and gloves to protect myself. But I also heard sweeping and mopping can cause miscarriage which is most of what I do... is that true?

Also I’ve been having some cramping and lower back pain. Is that normal or should I be worried? I also am constipated and take iron supplements which have caused pretty bad cramps before I was ever pregnant so maybe it’s that mixed with pregnancy cramps? I’m just so scared that something is going to go wrong this time. I have another dr appointment in a week.

Thanks!