TTC and frustrated

Hi ladies, I was looking for a bit of advice.. I posted this in IUD removal but the group is pretty quiet.

My mirena came out on the 14th of January, three days later (the 17th) I had a 3 day long period.

I haven't had an actual period in over a year so I have no idea how long my cycle usually is, so I assumed it would be the average 28 days.

AF was due yesterday and there's still no sign of her today, I tested last night and it's still coming up as negative.

Has anyone else had this problem? It's getting super frustrating not knowing if I am pregnant or not hah