Ive been having irregular period since i was 16..from none to 30 day heavy periods.ive put alot of weight on in the past few years..my gp has done blood tests sti tests ultra sounds..nothing ive also started bleeding after sex im really worried now..they say it may be pcos but are not certain..they wanna do swabs now..what will that find?they said normally for abnormal bleeding they would usually give out the combined pill but as my bmi is too big they cant.ive been trying for children for 2 years now and nothing...whats happening to me???