If you suspect you might be carrying twins, there are several signs and symptoms to look out for. Firstly, rapid weight gain and a noticeably larger belly than expected could be an indication of a twin pregnancy. Additionally, experiencing more intense morning sickness or feeling fetal movement earlier than usual can also suggest multiple babies. Other signs include elevated levels of certain hormones, such as hCG, and an unusually high number of fetal heartbeats detected during prenatal check-ups. However, it's important to note that only an ultrasound scan can provide a definitive confirmation of a twin pregnancy. If you suspect you may be carrying twins, it's best to consult with your healthcare provider for proper evaluation and guidance throughout your pregnancy journey.