3 weeks late :(

so hubs and i have been nonchalantly trying for over a year. the past 5 months we REALLY trying...ovulation test and all. my periods are regular since being on birth control for 4 years (3 with the nexplanon then the pill for 1) before getting off after we got married july 2017. well. im LATE...3 weeks late but all billions of test ive taken are big fat no's. according to google IF i am preg i should be 7 weeks 2 days. my cycles average 33-35 and my last period was jan. 2. i have an 8 year old son and to be fair it took 5 preg test to come up positive and got my first sono with him at 6-7 weeks. im starting to really worry somethings wrong. i feel like i have preg symptoms like cramps, boobs sore, fatigue, nausea without throwing up, and heightened smell. anyone else really late and still getting negative test? this will be my hubs and i's first (my second) and we're so ready and tired of being disappointed everytime.