What does a miscarriage feel like?


I'm so sorry if this is insensitive, I really don't intend it that way! So I have only had two periods since my son was born last February. January 8th-15th, and another that started yesterday a week late. Today I have had INTENSE vaginal/cervical pain that feels like when I was in labor and I was dilating. I took out the tampon I had in after a couple hours because I was so in pain I had to leave work early. Taking out made no difference even though it was 8 hours ago. My cervix is low, open, and very soft. I made an appointment with my OB GYN doctor but I can't get in until Friday am. I took a pregnancy test this morning and it was negative. I also just started getting very shakey. Any advice is appreciated!