Brown discharge at 5weeks?

I missed my period last Wednesday and didn't think I was pregnant as we last did the deed 3days before I ovulated, know what date ..17th July and last period 27th June with 34 day cycles so today would be approx 5+2, anyways took a test and faint faint positive, then at docs confirmed again by it being faint. Last 3 days I've had a bit of brown discharge was a few specks then I just put a tampon in halfway to see what was happening and was watery type brown discharge but most didn't come out much.seems most is still up there but only bits come out, Today, whilst walking around shopping, came home to about 1/4 of a liner worth of dark brown blood/discharge.....then nothing this arvo till I wipe, had a tiny small tinge of pink. I have no pain or aches, last pregnancy didn't have much at all had a bit of brown but not this much to notice. I have a 1yr old already, and few months ago early miscarriage I was told was sooo early not to count it, me testing day befre period due and then positive then cramps and lost it, wouldn't of known if I didn't damn we'll test lol....anyways, should I be concerned...haven't got a scan till next Thursday so b just gone 6weeks by then