I have been drinking around 8 glasses or (2 litres of water) a day... and had my growth scan at 30 weeks where ARI was 12.97 and even at 31 week scan she said all looked okay.. I don't have BP or any other issues.. and I am not really leaking... I just don't understand can this happen due to dehydration in two weeks( I admit it's been crazy hot here in past 2-3 weeks)?  Can someone please help me with some suggestions and some experiences of the same?

Update:: I went in for my scan yesterday... the AFI is 6.82.. doctor recommended a Doppler as well... the baby is measuring a week ahead at 34week 5 days and 2.5kgs ( I m 33 week 5 days) but baby Was almost 2 week ahead at 30 weeks so I am worried the growth may have slowed down.. also I have no reference to know if in last 4 days fluid has gone up or not, as my OB didn't give me a no last time... she has called me on Wednesday again as she says it takes 7-8 days for L-arginine solution to show some changes... I am also drinking like 5 litres of fluids daily... she said if the fluid doesn't go up she may have to give me injections daily to ensure that the pregnancy extends till 37 week atleast... I am very worried... I can't stop googling and can't sleep... can someone please help me... what injections are given... and What else can I do... also do any of u mamas have some experiences that can put me at a little ease... please 🙏🏻