18 days late, negative tests, white discharge, help?

[NS1590]

Hi, I need some help please !
I'm only 17 years old and I'm 18 days late for my period; my periods are always regular.My boyfriend and I had unprotected sex multiple times  (not trying to get pregnant) on about 4 occasions he did *** inside of me; within 2 weeks. I've taken 3 at home pregnancy tests,  which were all negative. I'm having alot of symptoms, including; headaches, back pain, cramps, white discharge(sometimes I think it's my period started, but when I check it's just white discharge), tender breasts(sometimes), nausea throughout the day, extremely tired(I sleep every chance I get).
I'm not sure what to do because it's the holidays and my doctor is off for a week and she's very busy. Please help.

[NS1590]

I have a doctor's appointment tomorrow

[shay70199]

Were you pregnant?

[RockRose]

I went to your profile,  and it's unlikely you're pregnant.  It's unlikely you're ovulating,  at a weight of 90-95  pounds.  I'm a little surprised your periods are regular - because when I was your age,  I was your size too,  and my periods were very irregular due to being underweight.  

You have said your doctor is off this week - when she/he returns,  you should call and get at least a phone consult.

Best wishes.  If you're not trying to get pregnant,  you should use some birth control method and not have unprotected sex.  

[NS1590]

I am now 20 days late...

[RockRose]

Did you use first morning urine when you took the pregnancy tests?  If not,  buy another one,  and use first morning urine tomorrow.

[NS1590]

For the most recent one I did, I took it about 9am.

[NS1590]

What should I do?