I might be leaking fluid

I have had 6 pregnancies but only 1 live birth... when I went in with her at 37 weeks I had lost most of my fluid and had to get her out ASAP. I am now 29 weeks 4 days with this baby and I am not sure if I am leaking again. I have a wet line down the middle of my underwear but no other side effects. In the past I did not know I had lost fluid. I was in contact with my dr yesterday but hate to go in to test and it be negative and then I feel horrible for going in. Has anyone else been in a situation like this!?