Hello….I’ve had sex like a week & a half ago…It was my first time…but..now like a week after I’m feeling sore in my back and stomach…and i’ve been experiencing frequent headaches, having some light headedness, my breasts, do feel a little different, but I’ve been getting tired very easily…I mean I will feel tired right in the middle of the day..even when I haven’t been doing anything. Could these be symptoms of pregnancy?