Yeah, likely you could still be pregnant. The actual joining of the egg and sperm and the attachment of the uterine wall doesn't actually accur until about 10 days. So obviously your period came cause your body doesn't know you're pregnant.
It takes a while for the hormones to start showing on pregnancy tests. In about 10 days, the egg and the sperm will attract to your uterine wall (you may see some spotting) and that's when symptoms will start to occur (breast tenderness, nausea, fatigue, headaches/dizziness) However Since you are very young and probably started your period a couple of months ago, the first 2 years of a period are highly irregular so you may have a delayed or missed period and it could just be your cycle. There is really no way to know unless you start developing pregnancy symptoms or it also may be a cause for concern if you miss your period which could be pregnancy but it could also be due to the fact that periods are very irregular for the first 2 years.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.