I talked to LSAC they said we should get emails 3/30 and 4/1

You should be able to up until the week of the test. Go to your LSAC account and click on View LSAT Registrations & Statuses. From there you can change the date of your test.

I did mine the day before I took the LSAT. Mine only took four days to get approved. I would recommend you do it before the test, so you get your scores on time.