thank you for writing in HMC
firstly after an abortion irregular bleeding and irregular periods
are very common. it could be the hormone changes during pregnancy
or also an infection or maybe there are chances of having retained products of conception since you had a medical abortion
firstly you will have to get a USG done to find out if there are any retained products which can cause excessive bleeding and passage of clots and painful abdominal contractions as you said.
Pain is also a symptom of ectopic pregnancy which is eaily ruled out with a USG. get a routine urine examination and a urine pregnancy test done immediately.
Remember to take your pil everyday . keep a regular time for the same, like immediately after breakfast so that you wont forget, if you forget a dose hav one as soon as you remember it and continue the same days pill as usual and condom for the next seven days.