Advice please

So I'm about 12 days late my cycle varies between 33-37 days but normally falls on 35 so when I was at day 38 I took a pregnancy test and it came back negative so I just brushed it off as just being late but now I'm on day 48 and still no sign it's coming. I do have an increased appetite and I do feel like I'm peeing more then normal, but that might be in my head just because I'm hoping that I'm pregnant seeing it has been 3 years and 6 months since we have been trying to get pregnant with 1 miscarriage in that time frame. So my question is should I test again or still wait? The reason why I'm asking is because I'm afraid of another negative test and not have an answer on why I haven't started my period yet