Misssed period mid-July; nausea and vomiting until last Friday: heavy Bleeding commence cont. With huge clots and vaginal tissue; still bleeding (pv) now; blood test bHCG level at 4000 today. Sonogram shows no uterine gestation. Is this ectopic?

Maybe. Would need to see another level or two to confirm if dropping. If its an ectopic the level will often plateau, whereas if you passed most of the pregnancy already the level will drop. If you haven't seen a gynecologist, you need to and if bleeding severe, an ER visit may be needed. Molar pregnancy is also possible.