Irregular periods 7 months after stopping pill

In October I stopped taking birth control pills due to it causing severe problems with my mental health. Over 4 years I think I was on about 4 different pills (switched for different reasons each time) I was originally put on the pill for acne and continued using it as birth control after that. Before starting the pill i also had regular cycles.  Since coming off the pill I had my withdrawal bleed, then got my first proper period in November, again in December, February and then March. My cycle lengths were 41 days, 37, 42 and I am currently on day 62 and no sign of my period! I had condomless sex during my period in my last cycle and my boyfriend pulled out on time and went to the bathroom before sex. I am terrified that i am pregnant!! For the past month ive been really stressed with exams and other things and was getting PMS symptoms for weeks which made me believe that my period was about to start but nothing! I am so fed up of waiting and worrying and Ive tried everything. If anyone experienced anything similar I'd appreciate a reply! 

Your period could possibly be late due to stress. There is a chance that you’re pregnant as well. The pull out method is not effective. You can ask my sister who is nine months pregnant currently. If you’re not, it’s very well due to stress and make sure to use condoms in the future if you are not ready to start a family.