2 periods

I’ve had 2 periods this month literally they were a week apart and they both lasted a week I’m 22 I’ve been trying to conceive for over 2 years now and my second period started out with dark mucus stuff and then it went from that to dark blood that was heavy like but my normal periods usually last about 5 days and but I’ve never bleed this much in one month any clue on what may be causing this??