Hi 3isenough - I see you're not worried but I'm a bit confused by your post. Only very igh doses of oestrogen will be sufficient to suppress ovulation so presumably in your case even though you are taking 4 pumps - your cycle is still appearing.
The other possibility is, because you are not taking progesterone, then your womb lining could have thickened so that the endometrium is coming away spontaneously and indicates that you need to be taking progesterone. However the fact that you experience=d pms tends to indicate that it could be a true period.
All the same keep an eye on it - you really don't want to risk your womb lining thickening.
Are you planning on taking a course of progesterone (even if intermittently) and are you having scans to check your lining if you're not, and under medical supervision?
Hurdity x