Might be pregnant...Advise???

When I was 16 I was on the pill for 2 years and when I came off the pill I always had irregular periods and sometimes didn’t even have a period some months, however before I started the pill they was always regular.

I have now been with my boyfriend for nearly 3 years and we have been trying for a baby. Since about 18 months ago my periods went back to normal and have been like clock work every month.

I haven’t had a period since the beginning of March and I’ve taken 2 tests and both came back negative. Is it possible that my periods are going back to being irregular or should I consider seeing a doctor for confirmation?