My girlfriend and I didn’t have sex I mean maybe I touched vagina her after I touched some semen but I don’t quite remember if I did. Her last period was June 22, 2018 and last 3-4 days and we messed around on July 13, 2018. 8 days later I was paranoid so I gave her tests and said negative. July 22 she got cramps that only lasted that day. July 24 (34 days after last period) she got bleeding in the afternoon. This was on a Tuesday and was gone by Friday morning. 11 days after took first response and negative again. Can I rely on it or does someone think She got implantation or period