Labor and Delivery

Today I am 37w 1d and I am getting very anxious. I am worried that I will not catch my contractions in time, or I won't know the difference between practice and real contractions. I have been looking online every night for peace of mind but with everyone so different it is hard. At work co-workers say that I have dropped and I agree with them. She is so low that I have to sit like a man on a chair and I have to be careful going up stairs because my legs bump my stomach. I still feel pressure on my diaphragm and bad heartburn every night from the added weight though. Every so often I feel my entire stomach tighten and pressure that feels like baby pushing on me but I am not sure it is baby or braxton hicks. My mom had me and my sisters earlier than Est Due Date as well as my sisters with their kids. Maybe I am reading too much into this and over loadingi my mind but any advice or experiences would be greatly appreciated.