Real Bad Vaginal Pains

For the last three days I have been having real bad pains no this is not my first pregnancy but this is the longest I have carried a baby my first son passed away when I was ten weeks I'm twenty-six weeks today and I'm so nerves I don't know if he's trying to come down or what's going on I'm so scared I have an appointment next Monday but I don't know if I should wait HELP ME 😭😭