Could I be pregnant and could you become infertile after an abortion?

2–3 weeks ago my fiance and I have been very sexually active… I’m 19 and he’s 20 and i’m thinking I could be pregnant…. my period is due in a few days…. possibly in 3 days time…My symptoms are slight cramping sometimes…. so tired that I sleep so much or I feel tired during the day, as much as I would not like to share this following information… I’m constipated every few days, I feel nausea, VERY picky with what I want to eat… recently I’ve had sushi for the past week non stop… very hormonal too and dizzy…. my fiance is very over the moon about me being pregnant and keeps telling me he wishes we could have this baby… I wish so too… but we can’t have it so I’m going to have an abortion… we both thought, to have a child now would be unfair on all of us.. our families, us (We dont even have proper financial stability and we dont even have our own place to live yet and we are very young) but I’m very afraid because I have heard that you could become infertile after an abortion… is this a rare case or very likely to happen?