Is this start of labour??

All day yesterday the baby was really pushing down on me and it felt quite heavy. I was lying in bed and I kept getting sharp pains in my cervix any time he moved. But it stopped eventually after like 3 hours. I woke up this morning to go to the toilet to pee and then about 15 minutes later I felt myself leaking.

Watery substance that had a white tint to it (almost milky) was running down my legs.

Has anyone had this? Is this something to worry about ?