Mandy Moore has shared a pregnancy update, revealing she has had to change her birth plan after doctors picked up an abnormality.
The This is Us actor posted a photo of herself to her Instagram story, saying she was told her platelet levels had dropped.
The cells help blood to clot and can cause complications during birth - including the possibility of not being able to have an epidural due to the risk of developing a spinal epidural hematoma.
Low platelets in pregnancy can be due to gestational thrombocytopenia, a condition which affects roughly one in ten woman and usually develops in late pregnancy.
Captioning the photo saying: "Weekly platelet check at the hematologist", Moore asked her fans if anyone else had experienced something similar.
"My platelets have dropped exponentially during pregnancy and it's sadly altered my birth 'plan'. Any other pregnant folks in the same boat??"
The 36-year-old is due to welcome her first baby, a boy, with husband Taylor Goldsmith in the coming weeks.
Speaking with digital publication Romper, Moore revealed she and Goldsmith had been trying unsuccessfully to fall pregnant and she was preparing for surgical intervention when she spontaneously fell pregnant.
"I was fully prepared to go have surgery and fix my uterus and hopefully get rid of the endometriosis, if it was there," she told Romper.
"Because of this issue with my uterus, I was very hesitant to believe it and put any stock in it.
"I sort of was holding my breath until 12 weeks."