Is it normal that I only get contractions during the night? I usually start feeling them around this time and they last about 30 seconds every 10 minutes for a couple of hours and then they go away.....

Anyone else feeling this? Is it normal at 33 weeks? I had a little scare last week because I was having excessive discharge so I went to L&D and they said my amniotic fluid was low so I had another ultrasound 2 days later and thankfully it increased....but I started feeling the contractions after that for the last 4 nights....