Is 40 days long enough for a pregnancy test to be accurate and would i showing if were 6 weeks pregnant im very petite weigh about 115 pounds?

A pregnancy test that is taken 40 days after unprotected sex or after conceiving, is accurate in approximately 97% of all pregnancies and even more accurate, at the time you say you might conceive or have sex at 6 weeks.

When it comes to your weight as petite as you may be 40 days should be safe however some bodies produce the hCG more than others. If there's any questions in your heart that there's a possibility, a healthcare professional you're speaking with can clarify the proper time as well.