I appreciate your query.
Ideally speaking, when you miss a pill, you should take it the next day, alongwith the pill due on the next day as well ie. two pills the next day, plus the remainder of the pack as prescribed.
This you have already done, so no issues.
However, the important thing is, to use a backup method, such as condoms, for the rest of the month, before beginning a new pack the following month.
You mentioned that this was not done.
However, the mild symptoms you mention, are mostly non specific, and have nothing to do with missing a pill. Maybe due to taking a double dose of pills the day before.
Please use barrier method for the rest of the cycle to ensure complete protection.
Also, just in case you miss your period, perform an early HCG
Chances of conception are more if the unprotected intercourse
occurred around the time of your ovulation.
All the best.