7 days early Positive...

I tested positive on 1/4 (a week before my period was due.) It was almost an instant positive, and distinct dark lines. I've tested every day since, even testing with different brands, all positive. My last period in the beginning of December was only 2 days, one day of spotting then one day of regular, bright red average flow.

Has this ever happened to any of you? I don't know if I ovulated early and am farther along than expected, maybe it's twins, or is it normal? I'm worried because we lost one in Feb '16 and another in November. I scheduled an appointment but it's not for another 2 weeks.