Positive OPK?

Katie

Got BFP 2/14/17 after 5 years of trying and MC 3/21/17, decided to keep trying immediately as able and now I'm 4 days late and noticed yesterday... decided I had to pee on something and all I had were OV tests..... the test line showed up before the control line and Very very dark! Should I run out today and get a HpT? Or just wait it out a few days before getting my hopes up...... does LH surge right before AF