Ay, congrats! Honestly at 3 weeks, marami pang walang ramdam kaya don't worry if wala ka pang obvious signs, super early pa yan talaga. From what I hear from my mum friends, iba-iba kung kailan may symptoms, some feel cramping or slight spotting, iba may breast tenderness or super tired agad, pero marami rin talaga walang maramdaman ng maaga. Best talaga mag-take ng pregnancy test around 4-5 weeks or when your period is supposed to come para sure ang resulta, tapos schedule na with your OB para ma-confirm at ma-monitor properly!