“So Sarah laughed to herself [when she heard the LORD ’ S words], saying, “After I have become old, shall I have pleasure and delight, my lord (husband) being also old?””
GENESIS 18:12 AMP
Sarah did laugh. She laughed because of her unbelief and was moved by the age of her body. Don’t go by what you see, feel or hear! Instead, follow the Word of God only. Jesus wants you to laugh, not in unbelief, but in joy receiving your miracle.