Solar terms and viscera

That March, May and July refers to March, May and July of pregnancy, not natural months.

I don't know if the following is the answer you want:

According to the formula, a person's conception is carried out through 1 month's liver meridian, February's gallbladder meridian, March's heart meridian, April's small intestine meridian, May's spleen meridian, June's stomach meridian, July's lung meridian, August's large intestine meridian, September's kidney meridian and1month's bladder meridian.