I think it definitely depends on your body and the pregnancy. Â DH and I had intercourse twice the week before my duedate. Â After each time I had minor, consistent contractions for an entire day. Â That was on Wednesday and Friday I believe. Â Then I didn't have any contractions until the next Wednesday when DD was born. Â When my labor did officially begin (the morning before her duedate) my contractions were immediately difficult with little time in between. Â My labor only lasted 8 hours, which is pretty good for a firstborn I think!
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My theory is that my labor had actually started the week before, after intercourse, but stopped of its own accord until baby was ready. It was nice in the sense that my labor was shorter, but I certainly wasn't expecting the difficult contractions right away! Â I also think she may have come just a little bit earlier because of it since she was "acting" early when she was born. Â She had a LOT of vernix and other such things. Â So for me I think it made a difference, but again, it really depends on your body and everyone's different.