Implantation

Can somebody explain implantation to me please. I've pink discharge for 3 days today I had a tiny bit red/pink discharge watery today its only when I wipe sorry to much tmi. My boobs are sore tired. I'm wondering is it my period. And I was doing ovulation strip but stopped as they were annoying me. Period between 30 to 40 days. Last period was end of Jan to Feb 3rd. Thanks so much