Symptoms gone

i ovulated on 1.24.18 ( 5 days ago) & had bad cramps since . They felt like if i was getting my period and i had the back pain and everything . All the way up to 4dpo and it lasted like all night it was even hard to sleep . So now today (5 dpo) i dont have any pain other then i keep getting head pain . But has anyone else had this problem where the symptoms stopped & ended up getting a BFP ?? I am curious . I bought pregnancy tests yesterday & now i feel like i just wasted my money buying them because my symptoms went away . I still plan on testing in a few days but i feel like why bother if the symptoms went away ? So maybe i should just save it for next month because my AF might come this month sadly .. but please comment if any of u experienced the symptoms stopping and ended up getting a BFP