18weeks and cramping

... i know I did alot today and didnt have time to rest ...till now! husband and a few co worker r working on our new place so i cooked for them..i been cleaning cooking and takin care of a 1 year old .. maybe thats y im crampin no bleeding im scared i dont have a appointment till next month. what do u do when you cramp? i think i didnt have enough water as i lay here im chuggin on it but ugh im worried :/ i lost a baby at 17weeks last year