This week, if it worked out, the sperm and egg got together and mixed your DNA with your partner's. You probably won't know it yet, though, unless she takes a pregnancy test every time she has sex.
Whether you were actively trying, and waiting for results, or just letting it happen when it comes, the first sign might be a missed period. But by that time, she may have conceived two weeks before, when she ovulated, and you'll have been parents for two weeks without knowing it. So sometimes there are other clues, and they're pretty obvious. Some moms take their first sip of wine and almost throw up. Others actually feel a slight pain at implantation. Weird behavior, whether it's food cravings, or their hormones dragging you onto an emotional roller coaster ride, is another good sign to look for.
Peeing on a stick is usually the next step. (How many times in life can you say that?) The stick is usually right, but to confirm it either way, you can move past peeing on things and get a blood test.