Salam! Ah I understand la, the waiting game is so stressful especially when you're TTC Two weeks delayed with just brown spotting is worth checking with your doctor though, because it could be hormonal shifts from the pregnancare, stress, or just your cycle being a bit off, but only a doctor can really rule things out properly, especially since the UPT was negative. A few of my mum friends had delayed periods after starting supplements, so it's possible, tapi better safe than sorry la, get it checked so you can move forward with peace of mind! Jangan stress sangat ye, sometimes that actually delays things more. All the best for your TTC journey!