How big an ectopic pregnancy mass is okay. Ectopic pregnancies don’t just depend on the mass, generally the smaller it is the less chance of rupture. If an ectopic pregnancy has a large mass and the blood HCG is high, surgery for ectopic pregnancy is very likely. If conservative treatment has been done, and the mass gradually shrinks, and the blood HCG gradually decreases until the blood HCG decreases to normal, this is not a big problem. If the conservative treatment of ectopic pregnancy is unsuccessful, or if the ectopic pregnancy mass is very large, usually more than 3.0cm. And there is more pelvic fluid, it means that there is a risk, must be operated immediately, otherwise the rupture of the ectopic pregnancy will have hemorrhage, shock, which is a kind of gynecological emergency abdomen. The severity of ectopic pregnancy not only depends on the mass, but also on the blood HCG to see if there is internal bleeding.