I need opinions and advice!!

My husband and I have been ttc since August, before that my periods weren't too bad, they last about 4 to 5 days and were normal cramps and bleeding (I was also on BC for 4 years) Well when I got off my BC in August so we could start trying my periods were horrible!!! I bled more than I ever have and the cramps were so bad i stayed home from work a couple times.....with that being said on Christmas day I started to bleed a little bit not even enough to wear anything, the cramps were non existent as well. Then the next day it got a tad heavier and the cramps got a tad worse but nothing like normal. Then on the 3rd day I was pretty much done with bleeding and cramps. I have also had some cramping sporadically since had some light pink blood when I go to the bathroom. Implantion or break through bleeding or period or pregnant?? This period was nothing compared to even before when I was on BC. I didnt even wear a pad or a tampon the short 3 days.