LOL, you never can really tell. When I brought home a pregnant Belgian mare, I read everything I could find on here about what signs to look for that she was getting close. She went pretty much against everything I read. She had a full bag and relaxed tail head for nearly a month before she foaled. She never waxed up or dripped milk, she never went off her feed or looked any more uncomfortable than usual. She just suddenly had a baby one morning with no warning at all
I look forward to watching your mare get closer and I anxiously await pictures of the adorableness that will be her baby.