Fertilization occurs in the Fallopian tube.  Each month, you ovulate from one ovary or the other, and they do not necessarily alternate from side to side regularly.  So you could ovulate from the right ovary to the right tube for 2 consecutive months.

The only way to diagnose tubal blockage is to have a hysterosalpingogram (HSG).  There are no symptoms to indicate this condition.  Women with or without pelvic inflammatory disease (PID) may have at least 1 blocked tube.  Even if your HSG showed that both tubes are open, they may or may not be functional, meaning that they may not be positioned or lubricated correctly to catch the egg from the ovary and funnel it down to the uterus.

If both tubes are open, but you have a diagnosis of "unexplained infertility," it is possible that your tubes are not functioning properly, so you essentially have a functional blockage.  Chinese medicine may help, but you should also consider in-vitro fertilization (IVF).

If both tubes are structurally blocked, you must consider either microsurgery to remove the blockage, or IVF.  Natural treatments alone will NOT be enough to help you conceive.