feeling unwell for 4 weeks, breasts have gone up a size...

Hello Rachel,
Welcome to ehealthforum,
Lighter and shorter periods, swollen/enlarged breasts, increased tiredness, headaches could be suggestive of pregnancy possibility. Wait and watch for your periods. Look out for development of any other new symptoms if pregnancy is suspected. If periods do not start within 10 days of expected period dates, or if you get 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).
Take care.

Thanks very much for your help i have had a shorter period and light in bleed which means 1 sanatary towle but the blood was a black brown colour what could that be my breats still havnt gone to normal size and i did catch my ovulation day last month is there a high chance in pregnancy or low chance.

thanks Rachel