well I started on Friday and got off my flow on Monday. it started light was super heavy for one day…

well I started on Friday and got off my flow on Monday. it started light was super heavy for one day then got light again.. is it supposed to be like that after you been off birth control for almost 2 months? it used to be for 7 days and stay heavy? I'm a bit freaked out cause we had to change plans of getting a bigger house cause we had to use the money for other things. but I can't be pregnant right. id be happy if I was but we just don't have enough room at this moment in time so it'd be bad timing...