Pregnancy symptoms no period had sex and now light bleeding. Could I still be pregnant. Bleeding began after sec?

Early pregnancy. Light bleeding in very early pregnancy may be "implantation bleeding". It could also be a miscarraige. There is not much any dr's could do about it, unless it is accompanied by pain on which a gyn consult with an ultrasound may look for an ectopic. Buy a pregnancy test. And follow it up in about 8 weeks with your gyn if your test is positive.