Date Concern

So I'm a little confused... done a clearblue weeks test last Sunday which said 3+ weeks... meaning I'm about 5 week I believe? However my LMP was actually only 4 weeks before then. My concern is my Period in January was slightly late and not normal... as in very light, a bit patchy, kind of short.... do now I dont know 😩 cant get a doctors appointment for another 2 weeks and I'm just torturing myself with worry at the moment!