Me and my gf hasnt had sex at all last month her period came the 22nd and ended 26th the month of april we had sex protected on the 9th and the 16th then the 17th I fingered her for a while she started a diet of apple cider vinegar last month after her period all the way til this day she took ibuprofen for cramps and headaches but and she has been going through stress during this month of April and her period didnt come the 22nd as expected and its now the 28th and hasn't came could she be preg?