HELP!

Okay I wasn’t sure where to post this but I guess I can post it here.

Sooooo I haven’t gotten my period since December, I have been constipated for about 3 months. When me and my boyfriend have sexual we don’t use protection he never comes inside of me .... I took regular pregnancy tests and they all came out negative also I went to the hospital for abdominal pain and took their tests as well and it came back negative. Some days I have a smell (fishy like odor) down there that isn’t normal....I drink lots of water and recently cut off eating red meats (beef and pork). When I went to the hospital, They told me I had acute constipation and gave me a prescription for laxatives for two weeks as well. Long story short I’m still constipated and they told me not to come back to the hospital if I’m still having pains, go see my doctor. I made an appointment to go see my doctor... but what do you guys think is wrong please help me I am a worried teen that doesn’t know what is going on?