Pregnancy scare , Delayed Periods. I do!

Actually I had My last periods on 11th September Me and my partner on 17th September didn't have sex but our private parts came in contact with each other rubbed against, he didnt ejaculate in me for sure , there was no penetration even , but in scare of pre cum I took an unwanted 72 on 18th September, now I have a cycle of 25days so on 5th October normally I would have got my periods on 27-28th September I had pain in my breasts with clear vaginal discharge , my periods is delayed , today is 9th October, I took an upt done in morning with first sample it came negative , I have low haemoglobin around 10 and even have b12 vitamin d deficiency, I'm scared as I can't go on for repetitive tests as well as I'm sure there was no ejaculation, sven took pill within 24 hours , please help me what should I do