Brown discharge

It been exactly 1 week that I've been spotting and no sign of a period I get faint cramps once in awhile but that's it I've been wearing a pad and it will only be discharge and faint blood but it don't fill the pad then after me n my bf had sex I bleed for a second then it's back to brown discharge .... Yesterday my mom said I was glowing and said me and my boyfriend trying to have her as a grandma early lol but I'm getting worried with what going on with my body...