Copied and pasted - I hope the original poster of this info doesn't mind?
If you have low progesterone levels then your body wont be able to continue with the pregnancy, or chemical pregnancys happen. You can have what i am on there called progesterone cyclogest, i am taking them this month while in my 2ww just to give me that extra support hence i have suffered losses before & they do help prevent another loss.
There is a number of reasons why you are miscarrying so early, Chemical pregnancys can be down to a genetic chromosome fault, where during conception the cells have not divided properely there for the body will reckonise the fault in the embryo onec the embryo implants & starts to develope hcg. The embryo will stop growing & cancel its self out. There is loads of woman who have had more than 1 chemical but gone on to have a successfull pregnancy.
Another is womb lining problems, i.e fibroids. polyps, inside the uterus that can cause problems when a embryo implants which causes early miscarriage, OR a blood clotting problem that can also cause miscarriages. With your type of early losses, people are given 75mg of baby asprin to take the day after ovulation & some progesterone support. See your gp see if he can offer you this support, am not sure if you will be refared to see a miscarriage dr, because you have to of had more than 3 before they will take it seriouse which is disgusting i know.
If you dont get any help from your gp, then you can buy the asprin over the counter, it has to be baby asprin 75mg, however before you do so, i would speak with your doctor about it & see if he can suggest somthing or suggest some hormone tests to be done.
I am now going to go into the whole dr head of mine hahaha. There is somthing called immune disorders, natural killer cells, these are inside the uterus they can stop implantion so you dont get pregnant or they can let you get pregnant then stop the pregnancy from progressing. They eat away at the embryo as soon as its attached, or in later pregnancy like my losses, they eat away at the placenta, acting like my babies are what they call foreighn objects. Like a form of cancer, my body thinks i am unwell when really i am just pregnant, but my immune disorder is to high because of these natural killer cells. Steriods prednisilone help with these natural killer cells, & your supposed to take them from ovulation day up to test day, however these meds you can only be prescribed through your gp, fertility/miscarriage Dr.