Is this normal? 13 weeks pregnant?

I'm 13 w 1d pregnant. I have had only one prenatal appointment so far (june 2) and have the 2nd one next thursday. Since I found out I was pregnant I started to notice my urine was a little odd. Usually urine mixes with the water in the toilet but now, it seems to sink down to the bottom of the toilet. Has this happened to anyone? I haven't been called for updates on my urine test or blood samples yet. I'm a little worried.