Recently my boyfriend and I had unprotected sex that lasted perhaps three minutes, and my boyfriend didn't finish. At most, there was probably a small bit of precum. Is it possible that I could get pregnant from this? I've had some bloating and cramping recently and I read from a website some signs of implantation include cramping and a stuffy/bleeding nose, which I've both recently had. I'm worried that I've had implantation but I haven't had implantation bleeding or any spotting other than minor spotting after sex. Is it more likely I'm caught up worrying or am I seeing implantation signs?