You did not say how irregular your periods are and if you are on any contraception
. It is difficult to predict ovulation in irregular cycles. Pre-ejaculate
can contain sperms in a variable number and chances of pregnancy
are there if it happens around your fertile period. The only way to tell this is to take a pregnancy test with an early morning fresh sample of urine and follow it up with a blood test
and a sonogram if needed. Your symptoms are not specific- they may be premenstrual or due to hyper-acidity. Please consult your gynecologist for further suggestions. Take care.