This should be less common with most junglers starting their bot side this season. But even after you finish first clear and gank top/mid or both etc.. still zyra and cait will push the lane and make themselves an easy target for ganks when they are lvl 4. They also have the tools(plants and traps, yellow trinket, and should have your bot to low health if they have been successful in their strategy) to make that gank unattractive.
Say the enemy jungler starts top side though, just make sure to play with caution around 3:00-3:45 and definitely have a ward in the bush nearest the enemy jungle at that time if you are going to play an oppressive lane.
Say you are on their team though, and you should know where enemy jg started... ping them to play cautious and to ward those bushes they are most vulnerable from around that time. Also, if you think it is likely, well you already know it is likely that cait and zyra will play like this... then plan to counter gank around the time that the enemy jg will be on the bot side of the map. Or go down there and ward for them and do the scuttle crab. I usually always buy a control ward on my first back to help protect my lane i feel is most vulnerable to ganks.