31 Weeks & Feeling so Tired

Hi mummys, I am currently working 12 hrs 5 days per week and this month is going to be super exhausting as there is no PH and only 8 off days. I did take 1 AL and decided to take MC during my hospital appointment but my working schedule still seem tiring working 4-5 days straight for 12 hours. Im currently going to KKH for check ups and I heard that they wont ever give HL easily. How do I go about it? Im super tired. Sometimes I feel like knocking off during work but Im alone most of the time & it’s a customer-facing job. Even had lunch at the counter. Hope someone can advise me on what to do