constipated like a mf

I haven't pooped in like 4-5 days and I thought it was kinda normal then I started thinking well shit... that's not normal & ive been trying to poop like every 3 hours but I couldn't anyways. I took pedialax chewable tablets for ages 2-11 bc that's all I have.. I'm 17 and I took three. It recommends 3-6 tablets for older "children". So is this going to work even though I'm not in that age range? I'm just trying to shit :( lol