Hi Angelique
Congrats with your pregnancy!
I had blood in my urine in my 2nd trimester with my 1st pregnancy. It can be due to a kidney infection, bladder infection, kidney stone etc.... In my case, it was because baby was pressing on my kidneys and my urine couldn' t pass through properly. I had to get stents in to rekieve that pressure.
Gynae also explained that any infection is dangerous to bith baby and mom and that it can cause pre term labour cause the infection can go into the amniotic fluid.
The antibiotics is there to keep infection under control and to protect baby. Even if you have thrush or bacterial infection down there and give normal birth, doc will give antiobiotics so that baby doesn't get infected.
Did you get your results?