Little background I am nursing my almost 2 year old and have had irregular periods, but my cycles have began to regulate the past 4 months.

SO and I tried 2 times but not really at the right time (were kind of just not being careful) , one 6 days before period was due, one the day before.

I have been taking tests since about 4 days past when my period was expected but they’re all negative. The past 3 days I have had cramping, and 2 nights ago I had pinkish/brown tinged discharge. I am so tired, and my boobs hurt but I’m also nursing a toddler. Could I still be pregnant even with negative tests? My period is 11 days late.