If you wait till you have six months with the right amount of income plus your last P60 which shows you earn over the £18600 that's what I would do.
Terpe might be able to advise otherwise.
I would take a look at the UKVI guidance on how they work it out.
https://www.google.co.uk/url?sa=t&so...a8CfjJQmi_iT2A