Is there a way to detect if the load is conected on the circuit above? (The other load should be connected to the F Pad, sorry for the mistake).
Figure 1. Current indicator.
Something like this may work depending on your load current. The diode bridge will drop about 1.4 V at a reasonable current and this should be enough to light an infrared LED as found in an opto-coupler. I've shown two arranged back to back so that a pulse could be detected on each half-cycle.
I have not tried it.
Figure 2. A current transformer and indicator lamp.
Devices such as that in Figure 2 are a safer means of accomplishing the task. In this case the visible LED can be replaced by an opto-isolator LED but get a back-to-back type or put a reverse diode in parallel so that there is a current path on both half-cycles.