"little" contractions at 39+2 on DC2

[elelfrance]

Since this morning i've been having contractions every 20 minutes or so : they're not painful, but definitely there. This is my second baby, last time, early stage of labour lasted about 14 hours, so i'm not heading for the hospital this yet : and i'm not even sure its early labour yet - these contractions really don't hurt
Anyone else been through this ? Could these contraction go on for a few days yet, or should i be getting myself organised ? (ie warning PILs who are nearly an hour's drive away and will be minding DC1)