Delayed Periods. And what abt pregnancy.

Hello, Me and my girlfriend got into unprotected sex after her periods got over 4/5 days ago. Post sex, we was slight tensed and so I asked her to take ipill. She tooked an ipill within 48 hours of unprotected sex. Post taking ipill, she went into many early symptoms like back ache, stomach ache, headache and also bleeding for 2/3 days. Slowly slowly everything started being normal. However we then also tooked pregnancy test after 20-22 days of unprotected sex, the first time it was totally blank. The second time we found one dark line (negative result) but after 10-15 minutes we also saw a slight rarely visible 2nd line on kit. And the third time again we got a one dark line but again after some time, we saw a rarely visible another line. Now after all this 3 test,we are now again tensed because her periods cycle comes on 23/24 every month. It is 3rd august and she haven't got her periods yet. please suggest when she can expect periods and what abt pregnancy. thank you.