Mommas out there...

I'm 20, I had sex about 2 weeks ago (Protected..Yes I know condoms don't always work) 

Since then my period has been late by almost 13 days. This has NEVER happened no matter the stress I'm under, diet, or hormones. 

I was convinced my period came, 3 times but there's still nothing. A few days ago I spotted brownish pink and I thought for sure it was here, I had all the symptoms.. Nope. 

I get migraines sometimes when a big storm blows in and sometimes it pushes me to throw up, I had one last night and ended up throwing up a bit but in reality there was no storms or high pressure changes last night. I didn't think much of it because 1) My HPTs wer both negative 2) I am somewhat used to headaches, but this is more than before. 

Both of my tests were negative, I spotted, cramping, am tired, got sick, felt nauseous, had a few headaches, back pain, and a bit of white discharge. The only thing I don't have is sore boobs or darkening around my nipples, I'm not trying to get pregnant so this would be an accident. 

I'm trying to avoid spending unnecessary money on actual doctor visits along with that I don't have insurance or a primary doctor or anything like a GYN. 

My lower abdomen feels a lot fuller, when I laid on it the other night it felt fuller then usual, if that makes sense.. And I'm very aware of it.. Like I feel stuff happening.. If that makes sense, I just don't know what.. Thoughts?