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Hey! If anyone could advise me or give me some feedback on my current situation that would be great!

So, I am 20 and have a feeling I may be pregnant. I have in the recent months had my marina coil removed due to on-going issues with my Cervix. I hadn't had regular periods since I was 13 and have been on many different contraceptions due to irregular bleeding i was getting. Therefore made the decision to breifly come off any form of contraception to give my body a 'break'. Ever since I have had the coil removed my periods have been nice and regular and always fall on the same date near enough. 

A few weeks back I (stupidly) had unprotected sex. I was due my period a few days ago and usually get PMS symptoms such as chronic back and abdominal pain. Both of which I haven't yet recieved. Last week I had spotting for around 3 days. I took a home pregnancy test and it came back negative. I then went to the doctors Friday just gone (roughly a week after the 1st test) and that also came back negative. 

The doctor advised of course I come back if I still haven't recieved my period and see what is going on. Along with that  I have had some horrible headaches, slight cramping and my mood swings have been really awful. I just didn't know if it was possible to still be pregnant although both tests came back negative?

Any input is welcome and highly appreciated. 

Thank you!!!! :)