I gave one pg 600 on the 2nd she was standing on the 5th bread her on 5thand 6th was in the barn tonight and she stood again has anybody seen this befor and whats the chance that she bread

Might have bred a little too early. I'm assuming she's a gilt and not a sow. Most like to breed gilts 12 hours after they are standing in heat, but normally, your best breeding time to hit that 30 hour ovulation is 24 hours after standing in heat. If I'm able to really check for heats consistently, I will wait and breed at 24 and 36 even on gilts, especially if you are using a boar to tease with.

If you deploy the 12 hour after heat breeding process, then before putting that 2nd dose in at 24 hours, check to see if she is still locked up solid with very little assistance. If so, I would wait at least 6 if not 12 hours before putting in that 2nd dose.

Not much help this time, but hopefully helpful if there is a next time.

with PG 600 are they in standing heat and ready to breed on day 3-5 or are they just starting to swell?

Depends. In our uses of it, we've found the average standing heat to be around 4 to 5 days after the shot. Gilts tend to swell a day or two (or three) before they will actually stand. I've found that teasing with a boar gets you the best results when trying to pinpoint the start of standing heat.