Something weird happened?

So I got my period on the 4th of this month. My cycles are usually 31 days long. I'm actually in my fertile week and began to spot dark brown blood, I took it as either ovulation bleeding or my period was 2 weeks early. I though let me take a test this morning to see what's going on (I know it's way too soon as I'm in my fertile week) but I've had super sore boobs and nipples and a pinching sensation in the centre of my lower abdomen. Can anyone see anything? Or has anyone gotten pregnant after 2 periods in a month? Booking a doctors appointment Monday to see what's going on as I've just been diagnosed with pcos. TIA x