Im so scared

So im 11 + 3 and have noticed some brown sploges in my dicharge.Its really thick and stringy iv not really had and pregnancy symptons up to now but the ones i have had fatigue and sore boobs have almost disapeared.I had a sharp pain in my side yesterday and now im just so scared that im loosing my baby. We had sex last night and i read that the discharge can be because of that any advice id be hugely grateful im stressing out xx