essentially primulut is progesterone (synthetic) - your period arrives when your progesterone levels fall at the end of a menstrual cycle. what they've done is give you a "bandaid" solution - by taking the primulut, they've increased the progesterone level in your system, so the body stops bleeding. but as soon as you stop the drugs, you start to bleed again - which is what has happened.

it sounds like you have had a dense endometrium post birth, which needs to be fully shed, and each time you've started the progesterone again, it's stopped you actually getting rid of it. my last "post-progesterone supplement" bleed was so scarily heavy that i ended up in ED and had to have a d&c as i was losing too much blood and it was becoming a big issue for my health (and four months on, i'm STILL having issues related to that bleed). i ended up refusing to take the progesteron supplements they wanted me to take to "fix" the problem, realising it would only be a bandaid and i'd be back there as soon as i stopped taking them again, and instead was given cyklokapron - it doesn't stop the bleeding, but it does slow it a lot. a LOT. it makes the bleed much more managable while still allowing the shedding of the endometrium.

FWIW - it sounds like you have a shedding endometrium that you need to get rid of. it is quite common that the first AF post birth is very heavy, and sounds like this may be the case. and perhaps due to the gestation you were at with Reid, the hormones would have been different post birth so it's been worse. i would suggest seeing a GP (i know yours isn't back til end of the month, but can someone recommend another locally?) and see if they will look at options like cyklokapron to allow you to come off the primulut, bleed, but not be uncontrollable. the cyklokapron may have some side effects (i got the runs really badly, controlled with over the counter meds) but it was preferable to the extreme blood loss.

hope that has helped a little - feel free to ask anything more you need to know
BG