Bleeding. Bleeding means different things throughout your pregnancy. If you are bleeding heavily and have severe abdominal pain and menstrual-like cramps or feel like you are going to faint during first trimester, it could be a sign of an ectopic pregnancy. Ectopic pregnancy, which occurs when the fertilised egg implants somewhere other than the uterus, can be life-threatening.Severe nausea and vomiting. It’s common to have some nausea when you’re pregnant. If it gets to be severe, that may be more serious. If you can’t eat or drink anything, you run the risk of becoming dehydrated. Your doctor may prescribe medication or advise changing your diet.Baby’s activity level declines. What does it mean if your previously active baby seems to have less energy? It may be normal. But how can you tell? Some troubleshooting can help determine if there is a problem. Drink something cold or eat something. Then lie on your side to see if this gets the baby moving. Counting kicks can also help. As a general rule, you should have 10 or more kicks in two hours. Anything less should prompt a phone call to your doctor.Contractions in third trimester. Contractions could be a sign of pre-term labour. False labour contractions are called Braxton-Hicks contractions. They’re non-rhythmic and do not increase in intensity. They will subside in an hour or with hydration. But regular contractions are about 10 minutes apart or less and increase in intensity. If you’re in your third trimester and think you’re having contractions, call your doctor right away. If it is too early for the baby to be born, your doctor may be able to stop labour.Your water breaks. You walk into the kitchen and feel a flood of water rush down your legs. Your water could have broken, but during pregnancy the enlarged uterus can cause pressure on your bladder too. So it could be urine leakage. If you are not sure, go to the bathroom and empty your bladder. If the fluid continues, then you have broken your water. Seek medical attention.Source: webmd.com