pink cm, day 48, bfn???

hello,
i have been lingering in here a bit, posted a while ago about my wierd cycle.
quick run down,
dd born dec 15 1009
still bfeeding her but has dropped off some feeds and has occassional bottle of formula when im working,
had af return 4 or so months ago wierd first one, as you do
dh and i bd with no protection at all for at least the last 3 or so months. happy to ttc.
want to ttc actually.
am day 48 of cycle today, bfn this morning poas, just went to pee, wiped and had slight pinkish cm.
last cycle was also 49 days- 7 weeks
and im usually a bang on 28 dayer.
Was just starting to wonder has my cycle changed since dd? also have 2yo ds.
am booked in to see in demand gp in 4 weeks
but was wondering could this be implantation? could i be pg?

thanks in advance, sorry for bad grammar, have the flu and velcro baby x
x madame x