Could I be pregnant?!

Hi y’all! I’m 3 weeks TTC. I had the mirena for almost 4 years and decided to take it out and try for baby number 2. My period lasted 7-8 days (I haven’t had one since I got the IUD) and I am ovulating currently. Yesterday I had slightly pink discharge and today it’s slightly brown like old blood or something. But barely there. Could that be implantation bleeding or am I just crazy and want to be pregnant ? Anyone else have any experiences ? Also, with baby 1 I didn’t have it. Or didn’t notice it I should say. Thanks!