I am nearly 19 weeks pregnant and have been having cervical monitoring due to a lletz treatment in 2012. My cervix is down to 20mm and I need a stitch but I need to stop my blood thinners for two days before they can do it. I am petrified. The doctor tells me that heparin and aspirin will not be totally out of my system and still thin my blood a little and the aim is to begin again on day 3. Has anyone any advice/been through this?