Thanks for posting on HCM,
around your periods may be due to many causes. Taking pregnancy test in an early stage of pregnancy might come negative (UPT are not 100% effective) and so it is required that you visit your doctor so he can request for a serum beta HCG
test and also for an ultrasound to determine the cause (and exclude pregnancy as cause). Other cause of abdominal pain might be pre-menstrual (and since you mentioned that yours feel different during this period, then that should be excluded), pelvic infection
, threatened abortion
I suggest you get properly investigated for pregnancy before you repeat another miscarriage
again. A preventable cause of miscarriage could be detected early enough.
Hope this helps and wish you the best