Working for "a month"

Cicily
Long story short today I'm 30 weeks and freaking out. I recently just got a job, and constantly been told I'm doing something wrong. Either I'm 5 minutes late, and I have been 8 times. Since the company is counting and apparently wearing leggings is a big no no for work attire. I just feel like this job isn't for a pregnant woman. Or me. I'm a sales associate but damn I think I took too much, more than I could handle. To make matters worse my car is broken down, and I don't have the time or money for it. Should I just help my mind and the company by quitting? I requested to have 4 hour days since I'm part time anyway, and 6 hour days are killin' me. I really don't know what to do. Any advice will help me.