Nicky, After a chemical pregnancy, your hCG hormone level needs to go down and you need to ovulate again before you can get pregnant. This is likely not to be a 28 day cycle. If it was me, I would wait for my next cycle for the serious baby making sex.
BTW, baby making sex can get pretty boring pretty quickly. With a 28 day cycle, you need to have sex from day 10 to day 18. You can also check for the fertile cervical mucus - super wet and stretchy like raw egg white. Even during this time, sex every second day is ok. The other times you can spend on intimacy, trying something new and sex for fun, rather than baby making sex. That way it does not become a job.
Best of luck TTC!