Aaah I can totally relate to the anxiety lah, sometimes our bodies do weird things kan! A few of my mum friends jugak pernah experience period delay + negative UPT with cramps and stomach discomfort, so you're definitely not alone. But honestly sayang, since you're getting body aches and epigastric symptoms like this, better get checked dengan doctor to rule out anything else, could be hormonal changes, stress, atau something else entirely that's making your period late. Hang in there and do update after you see the doctor, and amiin-amiin for baby #2 okay!