TMI! implanation bleeding??

heyyyy:) soo.. First round of Clomid complete, unsure of whether I got a positive OPK or ovulated before instated testing.. 5 days til AF is due and she is ALWAYS late! just been to the toilet and wiped.. what the hell is this?? no symptoms but very very tired lately and slight nausea every day. is this my implanation bleed? when can I test for pregnancy??! any help appreciated! xxx