Implantation bleeding?

Or is it the start of period or spotting?

the days circled are the days I had sex WITH a condom and he also withdrew long before he came.

the 14th-18th ‘period’ was dark brown blood, only red when it dripped out whilst on toilet towards the last 2ish days. so I was unsure if that’s period or not

I’m just so scared as I can’t be pregnant right now, and I don’t think I can test yet as it is too early? And I bled after the 9th so I took that as I can’t be pregnant :/// I’m only 18 so I’m really scared :((