Eh, nausea, sensitivity to bahan-bauan, spotting macam tu followed by late period memang confusing kan, especially when UPT shows negative, a few of my mum friends also had delayed periods with faint positives that only showed up later, or hormonal imbalances lepas stress/diet changes. Since you're already 2 weeks late and experiencing symptoms, better check with your doctor (gyno kalau boleh) to rule out pregnancy properly (sometimes hormone levels still low for accurate UPT), hormonal shifts, or other things like cysts yang you mentioned, takkan sakit tapi better be sure what's happening. Jangan stress too much dalam meantime ye, sometimes our bodies play tricks on us!