I was only on daily aspirin (my blood condition can cause hemmoraging and clotting, so I couldn't be on the stronger thinners for more than a couple days). We knew we were having a 36 week c-section and didn't do an amnio (but I had the corticosteroids several weeks before). For my condition, it was riskier, with or without medications, to let the pregnancy go on any longer than it did.
Two weeks before my c-section, I began weaning off the aspirin, and 7 days before the c-section, I took my last aspirin. I was told not to go cold turkey since the blood could start clotting faster in response.
I did make sure I was very active and well hydrated during those two weeks--basically anything I could to to prevent clotting without medications, I did.
24 hours after the c-section, they put me on lovenox for 4 days until I was discharged (now I'm back to daily aspirin).
Oh, and I also had a perinatologist and a hematologist supervising the entire pregnancy, including the 2 weeks before birth. I had 4 NSTs during those 2 weeks and was told to come to L&D immediately if I felt like the movement slowed for any reason (I didn't have to do that). So, during the weeks without the blood thinners, we just monitored the baby very closely.
~Brandon Michael (11/23/03), Jocelyn Lily Nữ (2/4/07, adopted 5/28/07 from Vietnam), Amelia Rylie (1/14/09), & Ryland Josef William (9/7/05-9/7/05 @ 41 wks).