Life, imho, begins at insemination. A heartbeat helps. In one of my pregnancies I experienced what is known as "quickening" and how amazing THAT feeling!
Within hours of pregnancy, a woman can note changes within her body if she's aware and paying attention.
A loving couplet oneness - a man should also be able to detect subtle odor changes and skin flushing in his mate!
Life from God to his Creation!