In general, it is not recommended to stain a porch while pregnant. Staining a porch involves the use of hazardous chemicals such as solvents and sealers that can produce fumes with potential health risks for both mother and baby. Additionally, strenuous activities like bending, kneeling, reaching and stretching can be difficult or uncomfortable during pregnancy. If you must stain the porch while pregnant, make sure to take all necessary safety precautions to protect yourself from any potential harm. Wear gloves and protective clothing when dealing with the materials; work in well-ventilated areas; avoid prolonged exposure to fumes; and don't overexert yourself by taking frequent breaks throughout the process.