Strange things

So ladies... I was on mirana from july to january.. Before starting mirana my periods were regular always started 28 days apart like clock work. I knew when they were about to start. Now being off the mirana ive had 2 periods. the first was january 5th the day i had it removed the second was febuary 20th my regular period date. Now that it is march 28th still no period not even a sign of one. My man an i dont really have sex often. Due to conflicting work scheduals, But when we do its spontaneous and protection is rarely thought of. Should i be worried. Or wait it out? regardless of the outcome pregnant or not im not worried im more worried because im a smoker an i like my wines. Thought an comments please.