I haven't charted my BBT at all this month, I dont know when I ovulated.....?

As i was ill from a UTI, yet again, I gave up this month as i had the 'whats the point' attitude....me and hubby only BD'd once this month due to me being unwell, keep thinking what if..... it was probably the day before or day of ovulation if I go by my past cycles... now im holing all hopes i may have.............this is so stupid right, I mean what are the chances of doing it once and hitting the target!!! I feel so low :(