Aih sayang, pain on one side like that especially during pregnancy memang boleh jadi scary, but honestly kena jumpa doctor ni sebab ada quite a few things it could be, anything from ligament stretching (yang common je during second trimester) to yang perlu check lebih serius. Jangan tunggu cuti lah, boleh call clinic and explain the situation, most doctors akan tekan-tekan schedule you in kalau ada pain on one side je, better safe than sorry kan.