Extreme thirst with twins?!?!?!

gill • I'm a mother of 5 beautiful babies, 4 girls chloe 10 lucy 4 Molly 3 and Macie 19 months, and my gorgeous son Adam 7 😄 I've been with my husband Cyril for near 9 years and married for 2 and a half xx
I'm extremely thirsty all the time, especially at night! I'm drinking pints and pint of water and never seem satisfied still have a dry mouth! I've never experienced this with my 5 other pregnancies so just wondered if anyone had with twins? I'm not worried or anyhring just had me curious and wondering if it was a twin thing?