Is this implantation bleeding or my period?

Me & partner are trying to conceive.

I have been taking folic acid everyday! We done the deed everyday through my fertile window. We used pre-seed fertility lube throughout.

I’m due on Thursday! I’ve been feeling extremely tired, sick, my breasts have been sore and grown, keep getting a doll aching pain in left hand side.

Yesterday, at 2pm I wiped and had extremely light pink and brown blood!

I put a pad on, and went for a walk in the afternoon, normally if was period I’d flow and loss a lot of clots but I haven’t done.