So, for the last 8 months I have had severe lower back pains and stomach pains. I have the implanon in worked fantastic for 18 months I got no period. Now I get my period 21 days a month, I have put on weight. I am not pregnant, I made my doctor give me a referral to finish as he thinks it s just my contraception causing it.im await swabs and blood test result, I just had a pelvic ultrasound done both internal and external. My right ovary (9.03m3)(2.88 3.81 1.56)cm has many black circles and shapes in it distance A 8.99mm. Left ovary can barely see a clear image of (9.7cm3)(3.45,2.74,1.95)cm also measured at 5cm3 (2.55,1.93,1.95)cm inside left ovary distance A 7.5mm . Also an endometrium of 2.33mm . Right ovary is oval left ovary is is really not a shape.