A month or two ago you were unlikely to be pregnant as you tested negative.
Considering you don't use contraception then in the present, yes you could be pregnant (although those symptoms are very vague and could be other things) so take another test.
If you take another test and are not pregnant and you do not wish to become pregnant then may I suggest some form of contraception and an injection of common sense. The former can be got from a GP or a sexual health clinic, the latter may occasionally be found to be of little use if the person having the injection is particularly immune to reason.