My front tire popped while I was inflating it and I had to buy a new one. Today I replaced it and filled it up, so I decided to refill the back tire too. I let all of the air out to start pumping it up again, but when I started I could hear the valve letting out all the air I was pumping in when I was about half way done. It was fine this whole time, am I going to have to replace this tube now too? I JUST WANT TO RIDE MY BIKE