It is possible to conceive twins shortly after giving birth, although it is relatively rare. The fact that you are noticing a faster growth rate and experiencing symptoms sooner than your previous pregnancy could indicate the possibility of carrying twins. However, these signs alone are not definitive proof of a multiple pregnancy. To confirm whether you are indeed expecting twins, it is essential to consult with your healthcare provider who can perform an ultrasound examination. An ultrasound will provide accurate information about the number of fetuses present in your womb and help determine if you are carrying twins or not. Remember, every pregnancy is unique, so it's always best to seek professional medical advice for an accurate diagnosis and appropriate prenatal care.