It's never going to drop or increase that much on a single quarters earnings - what unearth are you basing that on??
The fact that it's highly volatile. It happily drops, rises by couple hundred over a day or two without any news. Trading volumes are likely to be large. The last time it beat expectations it rose significantly. 31% on last profitable quarter. A similar rise (to that of the last profitable quarter) would take it over $2k. It was up a further 9% yesterday after the delivery volumes were announced.
If it turns a profit, some of the $18bn worth of shorts are going to have issues, causings the price to ride higher as they scramble for shares plus, inclusion in the S&P as trackers start buying. Some of it will be priced in but it's only ever usually a percentage.
Failing to turn a profit would wipe out Mondays 9% gain, plus likely see further falls as those who were in for a quick buck, speculators, and the individuals (there are stories of people borrowing to buy Tesla shares) are going to cut their loses as their stops kick in.
Not saying TSLA is a bubble, but according to most, the stock is over priced. A poor Q2 could be the tipping point. Didn't something similar happen with VW in 2018?
Average daily trading volume is 14m, it was 17m on Monday. I'm guessing it's going to be between 15-20m in the 24 hours either side of the earnings being released, so in my uninformed opinion there is plenty of scope for movement.