@freshstart82017 oh ok. Well your period can be irregular even after having a normal cycle. Since you had your tubes removed you will not get pregnant. So the only other reason your cycle is "delayed" is because you are just getting your periods back. Since pregnancy is not possible if you had both tubes removed, you more than likely ovulated later in the month or you had a cycle without ovulation. This is very normal.
Yes it's possible. I know someone personally who got pregnant with her third child after having tubal ligation. Anything is possible outside of hysterectomy.