24 days late and I really do not have any symptoms...

Hi,
Welcome to ehealthforum,
If after stopping with your birth control pills you have had your periods, and if they had been regular, it would suggest that your ovulation/fertility has returned back. If you were sexually active without additional protection around ovulation time, chances of pregnancy are possible. If fertile mucus had been present at time of intercourse, sperms can stay alive for 5-7 days and fertilize the egg upon ovulation. After ovulation, egg has about 24-48 hours to get fertilized. The symptoms that you describe (increased tiredness, mood swings, increased hunger/appetite, missed periods) suggest pregnancy possibility. Look out for development of any other new symptoms if pregnancy is suspected. If periods have not started within 10 days of expected period dates, or if you have got abnormal periods, or if you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). The urine pregnancy tests done early in pregnancy can show you false negative results as the kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet.
Take care.