I would definitely make a doctor's appointment in that case :) I can't tell yes or no as I am not- qualified in that department.
huni...first of all i dont quite follow your numbering in the way you follow your periods..i can but guess..., is 7-13 your ovulation time(obviously really the first mentioned),but you lost me after that....,i read through though and kind of caught up when you said about having clumps and brown blood.,brown blood is old blood,but then you say it turned to red and you had a period..then 4 negative tests taken recently...i think im up to speed...
i can see your concerns..and i see youve been working out...etc,
but i would bet my bottom dollar hun that after 4 negative preg tests an irregular periods you absolutely have nothing whatsoever to worry about