Constipation laxative pregnant

This constipation is horrible. I’m 31 weeks. I try EVERYTHING. Fiber, extra veggies to the max, multiple activists yogurts, cranberry juice, prunes, probiotics, collace, miralax, everything. Nothing ever helps. I actually threw up last week from being so constipated. Is it bad to take one tablet of ducolax (Bisacodyl 5mg) to get things moving??! I don’t want to take three tablets like recommended but I can’t find real negative effects of Bisacodyl 5mg online either.