1. Take a pregnancy test. with irregular menses, you ovulate irregularly. Therefore, it is unpredictable when you will be dropping an egg and could become pregnant.
2. Your first unprotected intercourse was 12 days after your last menses and in a "normal " cycle a woman will ovulate on Day 14 give or take a day or 2. Therefore, if this cycle was normal you could be pregnant.
3. Spotting CAN be an indicate of conception as many woman with have implantation bleeding when the fertilized egg burrows into the wall of the uterine cavity
4. Irregular uterine bleeding can be hormonally induce, caused by infection or have a mechanical etiology.
5. Only have unprotected intercourse ( and by this I take it you mean that your partner ejaculated inside of you and no condom was used) if you
a. are okay with getting pregnant
b. trust your partner will not give you and STI

hope this helps.

Be well,
Dr. Lara

Celebrating Women Center