are my periods irregular?

they normally start around 26-36 days after my last period.

example: let's say my period starts one month on the 18th and ends the 22nd, and my next period starts next month on the 12th and ends the 15th.

i've been tracking my period for 2 years and some months now and i was curious if anyone else's cycle is like this. google isn't always helpful when it comes to stuff like this. should i see a doctor or am i good?

also sometimes i'll have two periods a month, or end one in the beginning of one month and start at the end again, if that makes sense.