Help! Needing advise ! 💔

So I have had the worst backache for the past 4 days straight. Had little mild cramps the first two days of having back pain. The last day I've had sore back aswell as it aching sorta where my hip bones sit. My period is usually clockwork and I never ever get any symptoms till the day I get my period... I'm due in 4-5 days and the back pain has been consistent for the last 4 almost 5 days. I ovulated on time and my partner and I did the deed every other day around this time...(were trying for kids but not making a huge effort to have kids at this very moment....more so just letting it happen) I have never had backpain like this before and if I do ever get the slight sore back its the day after I get my period. My cm has gone between being creamy white to milky and watery.....Is there any chance this could mean I'm pregnant ? Or could it just be AF ... or anyone experienced this before ? Please help me out !