Ttc please help

Lauren

hi everyone....... I've bin TTC for about 2 years now and still no look for me....... me and my partner have bin trying alot more these last few months and now I'm 7DPO and I'm getting really bad stomach cramps and lower back pains too..... could this be a singe of implantation or could it be AF showing herself early, not due on till 5th October....... please can someone help