C section niche

Hi

I had a private scan about 6 weeks ago and a NHS scan yesterday which shows a c section niche. The private scan measured it as 7x5mm and stated the myometrium is also thin and measures 6mm. There is also a pocket of fluid on the site I am currently TTC and I did conceive in February which ended in a TFMR in May due to T16 and severe CDH. The c section is from my previous pregnancy in 2020. I have been TTC conceive since and was referred for an ultrasound due to spotting after period (but always stops before ovulating) and it was a suspected fibroid. I had a Private scan whilst waiting as I didn't know how long I would be waiting for the NHS one. I have been referred to gynaecology which looks like there is a 12 weeks wait in my area which isn't bad. However I am 35 and having had a baby with a chromosome abnormality, I don't feel like time is on my side. I suppose I wanted to see what other people's experiences were. I can't tell if the size is of concern. I know it can cause secondary infertility but I am not sure whether I should stop TTC whilst awaiting to be seen as I have seen it can cause uterine rupture.