Did I Miscarry???????

Hi,had sex some 8 wks ago on the last day of my period.Since then had another period of normal length, for me 5 days.In which was 3 wks later.On the last day of this period had sex again.However two weeks later I get another period which lasts 5 days again,not particularly heavy in loss,but this time accompanied with fatigue,light cramps,pain in groin and towards the end of period slight leaking breasts.The period has ended now 4 days ago and my breasts have very very slight leakage.I feel very worried about this and confused.Have had two pregnancy tests which both have shown negative.Normally wouldnt worry about these symptoms of periods,but its the leaking breasts that is really making me think twice that I could have miscarried and was unaware of it.I have also had three previous miscarriges.But this time I am so confused as to wether I was pregnant at all,partly because I have had almost regular periods and only had sex twice,both times on the last day of my period.I would be very greatful if anyone would give any sort of idea or advice.Thank you.Xxxxx