We are trying for pregnancy for last 2 months & my wife is experiencing mid cycle pains newly (around 10th - 20th day of her 27 day cycle), which are multiple short and sometimes pricking pains. could this be a sign of pregnancy?

Hard to guess: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result by 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after starting a "weird" period, or 1 week after missing a period. If one's normal regular period comes, then one is not pregnant.