First of all, I'm not a native English speaker, so please bear with me.
My boyfriend and I had intercourse 4 days ago, which means it was on the 9th. We did not use protection, in fact he came inside me by mistake but that would be too TMI to explain what exactly happened. I went to the shower and washed really good with hot water. I did not take any pill afterwards or anything. If it happens, it happens.
Today, on the 13th I had some spotting which became heavier through the day.
Now, I heard that implantation bleeding can only occur 6-12 days after conception. Other women said it happened to them even earlier.
Also, my period is irregular so I have no idea if it's just my period. Oh, and my last period was on the 25th of June.
So, quick resume: last intercourse (he came inside): 9th of July
first day of bleeding: today, 13th July
last period: 25th of June
Please, I need help before I go to the doctors. Any answer to my confusion would help.