Slowly re introducing some exercise after 3 months of not doing anything just got a pvc right after. is that normal for ppl who have the tendency ?

Yes: A premature ventricular contraction is a normal response of the heart to sympathetic nervous system stimulation. When returning to exercise it is very helpful to eat healthy foods, breathe and relax for a few minutes and then move in a rhythmic way for about five minutes and repeat this every three hours while awake . This can be increased each week until back to usual activiity.