Implantation?

So I've been so nauseated this week well this morning I woke to use the bathroom and I wiped had bright pink blood on my tp haven't had any since then just mild cramping my period is due in four days we have been trying for a baby since July 19 got off my period July 18 so I'm not trying to get my hopes up but if this is implantation when can I take a pregnancy test plz pray for me :)