Idk what’s going on !?!

I had protected sex in June then I started bleeding around the time my period was supposed to start (3 days before) then it started again four weeks later <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> is telling me I’m supposed to start my period in 4 days but idk is there something wrong with me my boobs are slightly sore and I’m having terrible back pain