Golden rule for trading or investing, is "never take advice from anyone"
You are always better off to trade off the charts, be it for daytrading or investing. The problem with trying to guess where price will go, within a certain time frame, is that there are way too many variables that can change things, just like the weather can change even though past predictions can show accurate forecasting for up to 3 to 5 days!
Example. The chart I posted with the blue box is the expected range for the 75 call from post date to expiry, which is May19.
As you can see, we have taken out the LER, so these expected ranges are just that, nothing more.
They are handy for a reference point, but, the charts always take precedence over all other analysis.
So what is next for DXCM?
Who knows, it all depends on how many buy and sell orders come in, plain and simple.
I do not know how you are working out your entry and exit targets, but if you are not using charts, then you really are just stabbing in the dark.
FWIW, I would not be surprised to see DXCM climb back into that box shortly, but as mentioned, you should always trade what you see, and not what you think.
This game does not give a damn about your thoughts or opinions, so best to lose them and learn how to focus on major levels and how price reacts when these levels are reached.
In relation to profits, well, it is wise to remember that you will never go broke taking profits, and greed will do nothing but cause you to give back the money you make.
Just relax, take a good look, place your trades, win or lose..over time the money will start to accumulate once you start to trade what you see, and not what you think