Help...

Sarah

Had my period 12th to 17th August, my periods have been very unpredictable lately, usually about 6-7 weeks between each one, me and my partner have been having unprotected sex hoping to have a baby, I started bleeding on Wednesday 5th september and ended yesterday (Friday7th) however wasn’t dark blood was light pink in colour and fairly light...could this be implantation bleeding or am I just getting my hopes up? When would be best to test??