Its Not Good Crossing Your legs when pregnancy it affects the blood vessels, when your 16 weeks you should not lay on your back because the same thing blood vessels and that can cause you to faint.
What Are The Things You Should Not Do While Your Pregnant?
Don't smoke cause it goes down to the fetus, don't drink any thing that has alchohol, don't over eat,and try lots of veggies and fruits its good for the baby even before the baby is born.