test negative ,use of condoms ,intercourse after ovulation,treated endometriosis
the probability of being pregnant is very very low.
These symptoms show that you should have urinary infection(do urine analysis) and hormonal
Irregular period _ you should do an ultrasound
to check your ovaries because the endometiosis is very recurrent(repeat).
If you have these problems for a long time you should consult with your doctor.
Take care of your self