Just some peace of mind

My husband and have two kids already and for two months we have been trying for our third. Last month we slept together on my peak day and a few more times on a high day and I got my AF. We are trying again this month. Same thing. Peak day and then once more on a high day. My AF is expected on July 14th and I am on a 30 day cycle. I have taken three tests so far at 5 days before Af and then today at 4 days and still negative. Is it possible I’m still testing to early? I’m saving the rest of my tests for my possible missed day but at this point I’m fully expecting AF to come :( any advice or just good vibes would help.