I'm late!

So here's a little back story...I got off my birth control back in April had my period the end of may. It was heavy but normal 7 days my next one started June 17 and it was 7 days as usual. I started bleeding as soon as I started cramping. My hubby and I have been using condoms but sometimes we wait awhile before he puts it on but he has not ejaculated in me at all. 10 days after my last period ended I had super dark brown discharge for about 2days. I figured it was just ovulation bleeding of just old blood from my period. So this month I am about 3 days late and I've been having period like cramps for 2days now but no bleeding spotting nothing. Yesterday I had round ligament like pains down there (I have 2children) I took a test last night and it was negative so maybe stress or my hormones just bein crazy and still not back to normal since bein off birth control?