Pregnant or not

Hi everyone,

I'm new here, so I'll introduce myself.
I'm 23 and have been in a relationship with my boyfriend for 7.5 years.
I was on the contraceptive pill for 8 years, but I recently stopped.
We planned to start trying for a baby within a year and were advised to stop beforehand;
now we're using a condom.
I'm now on a 39-day cycle and starting to get a bit worried,
I'm having period symptoms (stomach ache - dull lower abdominal pain - headache, fatigue...).
Are these signs of an impending period (coming off the pill) or could it indicate pregnancy?
I started reading on the forum and saw that many people got pregnant with this method
Should I take a pregnancy test or wait for my period (if so, how much longer?)
Thanks in advance, and wishing everyone a nice weekend (and happy pregnancy). X