Sayang, this is something you really need to check with your doctor or midwife ASAP, jangan tunggu lagi, especially since it's been 3 days. Cramping and aching at 13 weeks boleh be many things, but only a scan can tell you what's happening. I know first pregnancy macam semua rasa scary, but it's better to get it checked out untuk peace of mind, okay? No pendarahan is good, tapi don't assume lah, go in and let them have a look. Pregnancies can surprise us sometimes, and they're the ones trained to know. Sending you all the calm vibes!