Should I take off work?

I work as a cleaner of a huge stadium. Thursday and Saturday are two critical days because it’s playoff season. Which means for me that it’s long hours and extra work. I’m thinking about calling out because the sonographer said my cervix was 2.5 cm at 21 wks when I need to be 3cm. Someone said that it means theres a concern for preterm labor which has me a bit worried. The sonographer says I should take it easy and she needs to see me every week now to keep a close eye on my cervix. Also I’m feeling pelvic pressure right now and I just don’t know if going to work after hearing all this news is worth it. Should I take off for the playoff games on Thursday and Saturday or do you think it’s not as serious as I’m imagining it to be?