Oh, I've had these abnormal pap smears, and two Colposcopies. That was in 2006-2008. It really freaked me out. Low grade means it is something abnormal, but not cancerous. For me, I had cervical cysts the first time/ had one colposcopy, and then the other, she did a colposcopy and took a bit to examine. Both came back fine.
A colposcopy isn't something to get nervous about. I was, but it turned out to not be so bad. You might feel some pinches, but that's about it. I have taken a couple Motrin beforehand, because afterward you might have some cramping. Discharge is normal.
I am on birth control, and before that, I had discharge as well. Same kind as yours. I wouldn't be too concerned with it. Especially if you had it tested and it was negative.
Try not to worry. I know it's hard.( I'm a worry wart by nature myself). You could always have someone go with you. Sometimes that helps.