This is a bit of a delayed response.
I hope your pregnancy is going well?
I message in the hope of giving you some reassurance.
I too had a low PAPP-A score (I don't recall the score) but, it was low. Myself and my partner were both 36 at the time and this was our 3rd pregnancy, sadly we lost our 2nd early.
I remember reading research papers, reading through every mumsnet posts, asking my auntie who's a midwife what it all means. Going through a pregnancy during a pandemic is stressful enough, but hearing and not fully understanding what the score meant totally took away the experience of being pregnant.
We ended up having growth scans every 2 weeks, our midwife was concerned about our son's stomach circumference and I was measuring tiny! Our son was born 6lb and a 1/4 oz. He was perfect.
At 2 weeks old HV was concerned his head circumference had a major leap and wanted the GP to check- turns out hubby's family all have big head haha. At his next HV appointment he caught up on his weight and length.
10 weeks old Theo started rolling, 5 weeks old now and he's sitting. He is an absolute chunk! An absolute delight, so advanced and strong- way bigger and stronger than his older brother at that age!
Please enjoy your pregnancy, enjoy those kicks, take a bath- splash that belly..enjoy bonding. Go to those appointments and try not to worry. Please don't be like me crying myself to sleep. I worried myself sick...for no reason! X