Aiyoh, congrats dulu mama! But honestly, based on your timeline la, the bleeding on 9-13 March sounds more like implantation spotting rather than your actual period, especially since it was so light and different from your normal period, so I'd go with your last proper period on 1 February as your starting point , which puts you around 7-8 weeks now. The reason your UPT was negative before 27 March tu memang likely sebab HCG hormones were still building up and not high enough yet, some people take longer to show positive, especially if implantation happened later. Best thing is book your scan sekarang dengan your gynae, and just tell them exactly what you told me (the Feb 1 period, the March spotting, the late positive UPT), doctors deal with this confusion all the time and they'll do a dating scan to figure out your exact weeks, no stress. If baby kantung tak nampak, they'll just ask you balik dalam 1-2 weeks, it's normal procedure je. Don't worry too much, just get that appointment done so you can see your little one and know for sure!