advice please!

Elisabeth
Hi all (: so my aunt flow is due tomorrow according to this app, I'm always varying by a day or two.  I ovulated around two weeks ago(according to this app) and had my last period ended early December.  My hubby and I did the dance multiple times during my fertile window.  Yesterday I had light pink cm the one time that I wiped, and I've been noticing my cervix pulling back up more.  When do you think I should test.  I took a test two days ago and got a bfn.  But I read you can't even get a positive till implantation occurs... so I'm hoping thats what I saw yesterday!  Advice, please (: this would be my third pregnancy and have had two miscarriages last year.