Pregnant ?!

I have never spotted before until this month.. I bleed Nov 24-29… which I thought was my period went away and I bleed again on 2 and 3 and it was spotting when I would wipe but it was like brown on my liner.. again this morning I had blood when I wiped and I tested again and this time it came back positive … I’m pretty sure the test was expired because it was a left over one from when I tested with my son 2 year ago.. I’ll test again after work but how am I pregnant if I had my period