No period for 5 months negative pregnancy test what could be wrong?

Hi I had my period last November 22 and had unprotected sex December 11 and got period January 5 to 7 and from February to April 3 months I didn't got my period and I took a pregnancy test was negative. Is it a false negative?

I had my second daughter November 6th, I got an IUT, the plastic medicated kind. Now, I bled until about the middle of January, nearing the end of Jan. The IUT must have fallen out because it was completely gone by feb. But it was there before. I could feel it.
Now, I haven't had a period since, just one day with one wipe of spotting. Nothing more. And a negative pregnacy test. I have bad lowe back pain like I need to crack it but can never reach it, and super soreness. As well, I have this mole on my back for years and now it's scabbed over and itchy as what,my SO noticed blood all over the back of my shirt one morning from the itching in my sleep.
Please, advice would be greatly appreciated.

The last time I had unprotected sex was back on November 25 of 2016. Since then I have not had my period. I been light headed week sleepy hungry all the time. I been in the hospital 5 times since then due to my stomach hurting me and they done blood work and urine test and everytime it comes back that i am not pregnant. Lately I been having clear sticky discharge and been randomly bleeding which doesnt last long. I had one shot of the depo back in September. Could this all be because of the depo shot?

Hey My name is Julia . Im 19 and haven't got my period in 3 months. I have been to the doctor multiple times for pain and have took maybe pregnancy test and blood test all negative. I am not irregular or stressed . Not has really changed and nothing like this has never happened. I have been getting pain my my pelvic area and breast mostly . I feel sick at night and more tired . The doctor have took many test and they all say nothing is wrong and I have no illness or diseases . Also last month I had really light spotting for 2 days and 2 weeks after that I had a little blood clot come out . I didn't bleed after the clot it was just that . Sorry for the paragraph. Really need some help

I am not having clearly for about 3months.
I went through a miscarriage and after it I didn't have period for two months.
after 2months I had period but that was not clear. not even a day my period stayed.
the next month the period was more light.

what to do? is it a big problem? or may affect in my future pregnancy?

hello.. i am virgin n m having same problem no periods since 5 months.. doctrs have given some medicines but nothing working... still having same problem.. can any one help? gone through ultrasound... age 18

Hi there I am 22 yrs old I have had irregular periods in the past it all started when I was 18 I missed 3-4 months and took test but came out negative inwent to the doc and they told me I was not producing enough estrogen so they gave me these 5day pills to make my period come it did ! I had All my periods come normal different date but every month then again I stopped getting periods For 1-2 months then would get them and recently i went to the doc and once again they gave me 10 day pills to take and by the 7th day I got my period but for July 18th 2016I got it so I stppped taking them I got my period the following month August 25th 2016since then I have not got my period I been having unprotected sex have been since I was 18 but no pregnancy I have gained weight my stomach is big but BC I'm eating more I'm always tired I get light headed tend to sweat a little when I'm sleeping
Please help should I go get blood drawn ??? Or what I know this is not normal and don't want to keep using pills to make my period come. Thanks ,Vanessa