"had nexplanon implanted in my arm september of 2015. after 2nd month i began to have irregular periods. starting january 14th 2016 i have been bleeding ever since (2mo straight) with maybe half a day of relief. i&#039;ve had cramps, headaches &amp; been more tired than usual. now 6months on nexplanon &amp; am experiencing pains to the right &amp; left of my bellybutton area. called obgyn &amp; she recommended take 800mg ibuprofen to ease cramps &amp; decrease flow (since it is heavier than normal period). the blood is dark, sometimes&quot; rust &quot; colored or dark brown. now dr.says to have ultrasound done."