Haven’t been late yet... 6 days late but bfn?

Hey everyone, I tried posting this earlier but I’m not sure if it went up? Sorry if this is a repeat. I’m 30 and my husband is 37. I went off the pill in September and we’ve been ttc since November using opks (getting positive opks every month). Since ttc, Glow has been bang on with my period. Today I’m 6 days late for the first time. I’ve been crampy and bloated, that’s it. I’ve tested three times and all bfns. Am I testing too early? Should I make a doctors appointment? I’m only 7 months in to ttc so I’m not sure if I should even be excited or concerned being 6 days late?