Sometimes my bones ache, and i was not on any supplements when i was pregnant, its been 4 years since i gave birth, could this be the cause?

Possibly, but you do: Need a proper evaluation with an examination, investigations like routine blood tests, to get a proper diagnosis. Start with your pcp, so this all could be done for you, and if necessary, onward referral, as deemed by her/him. Good luck.

Potentially: An adequate intake of calcium (about 1200 mg as 600 mg 2x/day with measl using calcium citrate as it absorbs better and does not increase the risk of stones and other unwanted calcifications) and vit d (ususally ~ 5000 iu per day is recommended go to vitamincouncil.Org for more info)i very important exercise is also important a vit d level would be wise and you should discuss this with your doc.