When did you get BFP

How many days after what you would assume to be implantation bleeding did you get a clear positive pregnancy test? I’m just about at a year of Breast feeding my youngest and I have not had a period yet but I had random spotting last week- maybe Wednesday- and with the extremely sensitive nipple and being extremely tired, with bad back and pelvic cramps and I think my boobs are swollen to.. I normally when I’m engorged I pump 8-9 oz but I’ve only been pump maybe 6. Not sure if this is my period coming back or not as we formula feed our first. I have taken a pregnancy test on Friday with a clear blue and I thought I saw a faint line but then I tested these past to days with a dollar store pink dye test and I didn’t see anything .. waiting till Wednesday to test again but what are your thoughts ?