Sayang, please go see your doctor or go to the clinic TODAY, okay? Perut sakit sebelah kanan for 3 days at 26 weeks is something doctor needs to check properly, better safe than sorry! Don't wait lagi. Could be many things, tapi only doctor can examine you and know what's happening. Jangan worry, tapi jangan delay jugak. Kirim WhatsApp your OB sekarang or go straight to the clinic/hospital. Let me know once you've seen them, ya?