As you had a bladder infection and were given antibiotics to cure, your nausea
may have stemmed form the antibiotic usage. Heavy bleeding during periods may have been a sequel, though temporary, to the procedure. If you have not missed any period, you can wait for your next cycle to set in. Else, you can go for the blood pregnancy
test and exclude/confirm pregnancy. Infection of the urinary tract
can disturb the cycles and cause nausea as well. Please contact a specialist for further help. Take care.