weird body changes !! help

Since I lost my virginity a month ago I've only had sex twice, protected. Since then I've noticed several changes in my cycle as well as pms.
 My period came two weeks after we had sex but my symptoms included extreme fatigue and nausea for longer periods than usual. I know that sex throws off the vaginal pH balance and I've heard before that sex changes the bodily cycle. 
Since we had sex I'm also getting strange random whiffs from my vagina kinda similar to the smell of sex.. but when I check there's no scent ! 
It's been two weeks since my last period and I haven't even started ovulating yet, but I've been getting weird intervals of random spotting lately since my period has ended. 
Since then my vagina now discharges several amounts of clear mucus and other times I get a strange brown spotting discharge along with slight cramps. 
I panicked a lot initially thinking the spotting could've been a symptom of pregnancy implantation , altho I had protected sex and my period came after . But I read that implantation occurs 6-12 days after fertilisation but these symptoms have occurred long after we last had sex. 
I know y'all are going to advise that I see the gyno but I'm 16 and live in a country where teenage sex is not encouraged so I don't want my gyno (or MOM) finding out. 
Can someone please explain what's going on wth my body ?? Could this be pregnancy?? (even tho I was protected and my period came) 
Have these changes happened to anyone ? Could it simply be bodily changes due to different pH in my vag ? I need explanations ! 
Ps. Sorry about the length !!