i've been having my period for years and i've always been very lucky and rarely had cramps or pain of any sort. but within the last year the pain has been getting much worse to the point now that on the first day of my period i can barely move because i hurt so bad and it gives me stabbing back pain while it feels like someone is clawing out my insides. also recently i have been getting really long chunks i guess you could say of muscle up to 2 inches long. i was wondering why there is such a drastic change. and also recently i have been sexually active and my period came two days late with very very little blood and that large chunk i mentioned. could i be pregnant?