buying csl before report or after?

Hi, new here. I bought csl twice already thinking it was a good deal, only to have it fall through the floor again. I was able to sell for small loss on both occasions when it recovered a bit, no big deal, I'm wondering if it'll continue to fall. I often see a morning flush after some green days, and also see morning spike after red days. What is going on with its share price? Should i buy before the report on august 19? If it says plasma collection were not affected price gonna shoot up 10% in a day? But price can also go the other way...