Any ideas?!

Chelsea-anne • Hi my name is Chelsea-Anne. I`m almost 25. I`m happily married to darrel Bailey (27) been married five years in Feb 2016
Ok so I'm not due for AF to arrive til the 4th Nov but I have Pains in lower belly area like I normally do the day before my period. Could This be implantation? Lower belly getting a little firmer to the touch as well. All advice welcome.