Urine infection & unprotected intercour.

Yesterday I got little internal pain in my vagina during urine 3 to 4 time. After taking warm water, I felt bit good. Before also i suffered, & it's cured by taking prescribed medicine. Now I don't remember. And another thing I like to know, that last week we did intercourse without unprotected only for few min. Then again take protection then his fluid excreted. So before also my husband did three four times in same way, so to avoid risk, I was taking ipill & sometimes Nowill tablet. So I have a query, that its 5th or 6th time will be, so can I take the pill, or any other medicines to take. Please recommend. If by taking a max time in my coming future if it any danger, so I want to know. Please tell me on this. Till now I didn't take.