Received a letter.. help?

Raeleigh • 26, engaged 💍. we have a son age 7, daughters age 4& 1 🫶🏼

(Uk) not high risk but have had a letter for around week 16 to have a phone consultation with obgyn? It says about my “condition” which I’m unaware of? Has anyone else had this? Made me worry.. waiting for my midwife to call me to try get some answers.