Implantation bleeding or the start of AF?

My AF is due in 2 days. From yesterday I have been having this type of brown / pink discharge when I wiped only a few times not every time I wipe. Is this implantation ? I don’t ever spot before my AF. I had cramps and tender breasts for past few day’s but this morning everything has subsided and I’m left with just this when I wipe. Can anyone help me. This is TTC cycle number 2 with baby number 1. I’m really new to it all and would really like to know what everyone thinks. Also if you do think it’s implantation when shall I take a test? Thank you in advance.