So I am 18 years old I have had sex once and that was about 5 months ago so I know I'm not pregnant but my stomach hurts really bad for about 4 days now. And one day I went to the bathroom and pink was coming out of my vagina so I thought I started my period but I didn't and then today there's like brown coming out of my vagina and I read that it could be dry blood but I wasn't on my period so I don't know. There was no smell to the pink or brown. I am stressed and upset because my boyfriend leaves for the navy in 9 days so maybe that's why I'm late on my period. I've never been late before what could this mean?