Johnix, I have the feeling that you lost track of the months or the weeks on the calendar which has happened to me a few times.
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So, with that in mind, here goes. It is 5 and 1/2 weeks or 39 days until the 15th of June, not two and half or 3 months.
Pre-flowering and seeing some white stigma/pistils does not necessarily mean that the plant has started the actual flowering stage. I do not see any flowers starting yet and if it takes another week to get going then the plant has 4 and half weeks until the middle of June.
I have not read or heard of anything that indicates that an auto-flower plant will go through the entire flowering stage in a matter of 4 to 5 weeks. I was under the impression that the benefits of growing auto-flowers was the shortened vegetating stage as compared to photo-period plants and not a shorter flowering stage. In other words, once the auto-flower plant starts the flowering stage it will be 8 weeks as the average time, and longer if the gardener is looking for all those amber trichomes.
Depending on what is meant by week 4 ending on Wednesday it will be either 28 days old or 35 days old on Wednesday and it will still need another 56 days to get to the 84 days you are shooting for.