Cramps & Brown Spotting

Sharon • 42 & TTC #3 #1 for my gorgeous SO hoping for a girl as have 2 boys 14 & 18
My AF is 17th/18th but since the 15th I've been cramping & yesterday I've had very mild brown spotting but only when I wipe, I never cramp before AF is due & rarely cramp during AF could be what I'm experiencing be implantation cramps & spotting?? Has anyone gone through this??  Many Thanks in Advance xx