A lot of the time if your urine is very strong smelling and colored yellow it simply means your dehydrated.
Your urine should be clear and not really smell at all, drink more water, keep yourself hydrated, if it continues i suggest what Thankful2bhere said, go to the doctor and get a urine test. goodluck dear one!
Drink lots of water and also get a colon cleanser to clean out your UT
Any time that's ever happened to me it has been some type of bladder infection. One quick trip to the doctor and giving a urine sample could give you an answer. If not a bladder infection, the doc could probably help with other ideas. Good luck.