I'm showing my lack of knowledge about ovulation here, so please excuse me! A friend told me that the best time to dtd is just before ovulation but that once you have ovulated, it is not possible to conceive. Now,this has confused me because I thought 'ovulation' is when an egg enters the fallopian tube (?) and that if sperm is not already there waiting for the egg, the sperm can still fertilise the egg if it enters afterwards eh. In the 12-hour period the egg is still alive. Is that correct?