Whats going on??? weird period?

The rundown is I'm 27...been tryin to conceive w/ no luck. My period was 5 days late in May on the 26th started VERY light than normal than VERY light all within 3 days. My period is usually 5-6 days and medium to heavey flow. I took pregnancy test a few days before the 26th and it was negative. Well when I got the weird light period I ruled out pregnancy and went on w/ my life lol..well yesterday(18 days after my weird period) I started having VERY light brownish discharge..not enough for a tampon or pad. I took an ovulation test right before this brown discharge yesterday and one light was dark and the other was light...I've never had this happen where I had a late light period than brown spotting between cycles. I haven't taken another pregnancy test since before my weird period in May cuz as I said I ruled out pregnancy. I've also been havng a pinching like crampin in my pelvix area since this light brown discharge started. No I don't have an STD..benn w/ the same guy 11 yrs and just had a normal pap a few months ago....any ideas?