Painful period, never used to happen

Hi ladies,
Long story short, My cycles were always 26-28days every month. (26 one, 28 the next, 26 again etc)
They used to usualy be a tad painful for the first half of the first day and then just bleeding for the rest.
about a year ago my X-DF pushed me into a termination and since then, when af returned, the first 2-3 days are always complete agony but only light-medium bleeding, and my cycles went up to 38days (now going back down, last being 31).
Any ideas what this could be caused from? weather its the termination or its just happening?
Anyone experienced this before in similar situations?
I will be asking my Dr about this the next time I see him (in a few days) but I was just wondering about other peoples experiences/thoughts on the matter?

TIA..