2nd period after miscarriage late BFN??

So after my miscarriage in January I had my first “period” feb 21. It was only 3 days long and really light but I think it was my period anyways I of course was hoping not to get my period this month since we are trying but now I’m 9 days late and it’s been 3 weeks since I ovulated but I keep getting negative pregnancy test could I be pregnant or is my period going out of whack now?! So confused!! Has this happened to anyone? I just want to try and I hate that this is happening now