Implantation ? Pregnant ?

I just want input on what you guys may think I had iud for 2 1/2 years removed in December I haven't had a period since I had it put in. I had brownish discharge 2 days ago I had very light spotting yesterday and just today had more brownish discharge I had a negative test on Saturday any input or similar stories.? What should I do ? Since I don't know if I've ovulated since I haven't had a period .