I have been on Nur Istarate for the past 5 months and I have had a throat Infection about 2 months ago was prescribed amoxycilin capsules for the infection,I bled vigorously whilst takin my medication.Had sexual intercourse and now I have no sign of my periods this month. I am used to get my periods with the use of the injection,yet now not a sign I just spotted slightly about a week ago and there is no trace of my periods since.. Is there a chance that i have fallen pregnant,Does the above anti biotic flush out the contraception???