I’m not sure because the first ....

Time I got pregnant wasn’t planned. I found out by going to my yearly. I was 4 weeks along and never had one symptom of pregnancy. Anyways, we have been ttc #2 and I got my last period on Jan. 15th after removing my nexplanon on December 6th. And we BD a lot. We want our daughter to be a big sister so bad. I am past when I should have started my period but I took two pregnancy test last week and they were both BFN... so am I out and AF is just getting my hopes up??... ... according to that app &flo I should have ovulated on the 28th/29th... please give me some advice please!