My underwear smells like cat pee (tmi)

I went to the doctor and had an ultrasound done recently. Apparently the baby looks fine and the water around the baby looks good. The last two weeks I’ve been have water on my underwater. Me being me, I sniff it and it smells like cat pee. It doesn’t smell like normal pee so I’m concerned. My doctor has seen me, she said my cervix is closed as of a week ago. I’ve called the on call doctor and they told me the chances of it being water leakage is slim, being a stm the last baby weakened my bladder. I’m only 15/16 weeks. Is this normal?