UTI's

Me and my boyfriend have been having constant unprotected sex.. And when i say constant i mean like every 30 minutes, every time we see eachother.. As soon as were done i take a shower and try and stay as clean as possible. But i ended up getting a uti once and it hurt so bad, i then ended up feeling the same pain maybe a day or 2 ago, but not sure if its a uti , i just wanted to know if any of you know any ways to stay uti free 😭