Period After Abortion

My cycle was very short just 18 days. I found out I was pregnant and had an abortion May 16 everything went smoothly and I got my period June 20th. I got my next period July 16 meaning my cycle is 22 days. IF my cycle IS 22 days then I am 3 days late. (I used to use another period tracker app and it said I was supposed to get my period on the 9th, 4 days ago!!). And this app says I was supposed to get my period yesterday but since I had a abortion it is a little difficult to track my period. I’ve been using a condom every single time and I haven’t started birth control yet because I am a senior in high school my school provides free birth control and school hasn’t started yet. So I’ve been using condoms. I did use the “pull out method” a little over a week ago. My boyfriend didn’t cum in me but there’s always pre cum so I am a little stressed. I have tender breast and back pains which I do always get. And I know after an abortion your cycle is changing and sometimes doesn’t regulate for a long time. So is my cycle just not back to normal or can I be possibly be pregnant again ? Please help give advice or let me know if you had a similar situation!!