If your oral contraceptives cause you any significant side effects, it makes sense to consult a gynecologist to change the prescription. There are many options out there, and correctly chosen ones should not typically cause them.
In terms of pregnancies, oral contraceptives can be both more or less efficient that condoms depending on the mode of usage for each (and also discipline, don't skip either). Besides, for many couples accidental pregnancy is a bit of a change of plans, but not something that will warrant abortion or make children unwanted. Again, case-dependent.
It's okay to choose condoms as well, as long as partners are happy about it. If that gives you a peace of mind, you can even combine both measures at the same time! It's only important to remember that there are two (or more) partners involved, and all being happy about the choices made is crucial for great intimacy. Do not ever force someone to take pills if they don't want to, and discuss your options if someone has issues with condoms. Maybe the issues are with latex condoms specifically, with polyurethane options providing less allergenicity and better sensitivity. Maybe a diaphragm can be your option. Or maybe something else. You can always discuss, you're not on a gender war or something, you're partners.
Personally, I can't wait for male contraceptive pills to hit the market. Not only it will provide a solution to this specific problem, shifting responsibility for proper selection of contraception and any issues coming with it onto the people who need it the most, it will also provide men with more agency about their reproduction. Finally, you can combine male and female contraceptives to get unparalleled non-barrier protection with good insurance in case one partner misses the pill. Win all-round.
