I took my Nuva Ring out on October 9, I started spotting 3-4 days after removing it, but very little and for only 4 days. I had sex with my boyfriend on the 12th and the 19th, I started having cramping/pressure in my lower abdomen around the 25th, so for about 3 days now, but I am not bleeding. I am worried that something may be wrong, what could this be?