AF 3days late & 3 BFNs advice please

Danielle
Hi this is month 7of TTC. I haven't been on any contraception for 5 years (and that was just the pill) bar 2 months from feb-March for our wedding. I've never tracked my cycles until we started TTC and so far they have been...
Month 1 29 days
Month 2 30 days 
Month 3 29 days
Month 4 34 days (1 week late)
Month 5 28 days 
Month 6 28 days 
Month 7... 3 days late
I don't want to get my hopes up like last time where I just don't think I had even oculated so had a late period. But is there anyone else with random late cycles? And how many negative tests did you get before a BFP? Could I be pregnant? 😣