Implantation Bleeding

Hi Mamas and Mamas to be

My husband and I for months tried to get pregnant and then did but had a miscarriage same thing happened when trying with our daughter, we tried got pregnant but lost the baby then tried again and got pregnant and had a beautiful little girl (I also have a son from a previous relationship when I was very young) but this time we lost the baby and tried again but nothing and then decided to not try any more back in August and in doing so stopped paying attention to this app. Then on October 20th and October 21 my husband I had sex not trying just had no children those days and took them for granted lol and then today October 30th I started to bleed a very light amount and only visible if I wiped it was a light pink colour and thought well I'm a little early but I've started my period and got a pad on and went on with my day expecting to have major cramps like usual and heavy heavy bleeding would start instead I went pee again and noticed nothing and thought hmm weird it will start up had a little cramp nothing painful just noticeable and my hubby let me nap woke up did a few things and went pee again nothing then after the kids were in bed went and there was some light bleeding but this time more of a brown like old blood which made me think implantation Bleeding. So I went to this app and noticed that I hadn't logged September's period so I did and it said that October 19th and 20th would have been my ovulation days. But does implantation Bleeding happen this early? If it is implantation Bleeding would a pregnancy test come up positive now then if I took one?