I appreciate your concern. There are various reasons for spotting in pregnancy. The causes range from  a simple non specific bleed to a bleed for a low  lying placenta. So I wouldn't panic unless  all the possibilities are ruled out. So do not panic as of now. Progesterone and bed rest are empirical but not harmful. Get a scan then check placenta. Do you blood group. Do a urine test and vaginal swab test to rule out infection. Take care. Good luck!