My (now ex) girlfriend and I had sex 4 times in our relationship and used a condom everytime and she was on the pill after the first time.

1st time I pulled out and the 2nd time too, the 3rd n 4th times I went inside (in the condom)

She got her period after the first time which is when she started the pill and got it on the pill as described in the pill instructions.

After she came off it she had a period of bleeding again (as described in the pill instructions), and we broke up shortly after so obviously no more sex.

The thing is, she's not yet had another period since coming off and should've had one around now. She's had stomach pains and achey muscles today and has previously been quite tired.

Should I be worried about pregnancy? Or is it normal for her to be late when coming off the pill? (only been on about 2 months)

Please help asap

Thanks in advance