need someones advice/oppinion

okay so me and my husband just really started to concieve last month but for the past 3 years we where not trying not preventing I havent done opks I know shame on me and have just used calenders my periods go from 25-27 days my last period was on the 9th....my birthday of all days.me and the hubby have gone at it like bunnys till about a day or 2 ago my lower back is hurting it almost feels like theres a sock bunched up in my spine and for a day or 2 I was getting light cramps but now my whole lower tummy is just sensitive to the touch im soaking in a warm bath now to dampen the soarness my period shouldn't be here at least for another week or 2 I just sant someones oppinion if im over reacting or if this might be it ( I know it might be a little early to test yet) also my nipples have been soar been gassy too and going pee ALOT