The earliest symptoms like mild cramping or breast tenderness can start around 4 weeks, right around your missed period. However, symptoms vary wildly for everyone, so a blood test or urine kit is the only way to be sure.
Most women start feeling nauseous or bloated only after 5 or 6 weeks. There's no point testing too early and stressing, just wait for at least 4-5 days after your missed period to see.
I recently delivered my baby and I clearly remember my first symptom was this strange sensitivity to the smell of tempering (tadka)! That started even before I missed my date.
Usually, my grandmother says that extreme tiredness and a metallic taste in the mouth are the earliest signs. But my doctor told me a missed period is the only sure sign, so wait for that first.
Don't worry too much looking for early signs, behna. Sometimes you might not feel anything at all in the first few weeks, and that is completely normal too. Just stay relaxed.