Worried

I was having a normal day at work until all of a sudden it felt like I got my period so I went to the bathroom and it looked like I peed myself. I wasn’t bleeding but I’ve had an increase in discharge which is normal and I usually wear a panty liner but today I didn’t. So as my day continuous I started to get painful cramps that felt like my period. Now I’m concerned. A nurse called me and told me to track the cramps and if the get worst call back but my doctors is closed now and this all happened around 1:30 😭 anyone else experience this. I have had a miscarriage before and when I get cramps I worry. Should I go to the ER tonight? Any suggestions on what could be happening? I do have placenta previa the only thing keeping me positive is that I’m not bleeding but I’m 28 weeks and 3 days.