Just need an idea.

So I'm thinking maybe my pee is to dark normally it's like a very light yellow the last three weeks it's been dark yellow, now I'm not completely stupid I know I'm not dehydrated. I drink enough bottles of water in the day and night. I'm scared maybe of a infection. I'm 30 weeks pregnant. My doctor checked my pee and said all was good... what do they test for in your urine? Do they test for a UTI ? Or anything else? Anyone know like a nurse or someone more familiar with the situation? Also it has a strong smell like urine