Spotting tu memang boleh jadi normal dalam early pregnancy, especially after intercourse, a few of us went through that and turned out okay je, tapi sebab you're worried, best check with your doc atau clinic cepat-cepat just to be sure, especially since you're only 13 weeks. Better safe than sorry kan, and they can do a quick scan to confirm everything's fine. Don't stress too much lah, tapi jangan delay the checkup!