Women who have just given birth should wait at least three weeks before they start using birth control pills because of the risk of serious, potentially fatal blood clots, public health officials announced last week. Women who deliver by Caesarean section or have other risk factors for blood clots — like obesity or a history of previous blood clots — should wait at least six weeks before using these medications, they said.
via Wait to Restart Birth Control Pills, C.D.C. Says – NYTimes.com.